>01 The Language of Music A painter hangs his or her finished picture on a wall, and everyone can see it.A composer writes a work, but no one can hear it until it is performed.Profeional singers and players have great responsibilities, for the composer is utterly dependent on them.A student of music needs as long and as arduous a training to become a performer as a medical student needs to become a doctor.Most training is concerned with technique, for musicians have to have the muscular proficiency of an athlete or a ballet dancer.Singers practice breathing every day, as their vocal chords would be inadequate without controlled muscular support.String players practice moving the fingers of the left hand up and down, while drawing the bow to and fro with the right arm -- two entirely different movements.Singers and instrumentalists have to be able to get every note perfectly in tune.Pianists are spared this particular anxiety, for the notes are already there, waiting for them, and it is the piano tuner\'s responsibility to tune the instrument for them.But they have their own difficulties: the hammers that hit the strings have to be coaxed not to sound like percuion, and each overlapping tone has to sound clear.This problem of getting clear texture is one that confronts student conductors: they have to learn to know every note of the music and how it should sound, and they have to aim at controlling these sounds with fanatical but selfle authority.Technique is of no use unle it is combined with musical knowledge and understanding.Great artists are those who are so thoroughly at home in the language of music that they can enjoy performing works written in any century.01 音乐的语言
画家将已完成的作品挂在墙上，每个人都可以观赏到。 作曲家写完了一部作品，得由 演奏者将其演奏出来，其他人才能得以欣赏。因为作曲家是如此完全地依赖于职业歌手和职 业演奏者，所以职业歌手和职业演奏者肩上的担子可谓不轻。 一名学音乐的学生要想成为 一名演奏者，需要经受长期的、严格的训练，就象一名医科的学生要成为一名医生一样。 绝 大多数的训练是技巧性的。 音乐家们控制肌肉的熟练程度，必须达到与运动员或巴蕾舞演 员相当的水平。 歌手们每天都练习吊嗓子，因为如果不能有效地控制肌肉的话，他们的声 带将不能满足演唱的要求。 弦乐器的演奏者练习的则是在左手的手指上下滑动的同时，用 右手前后拉动琴弓--两个截然不同的动作。歌手和乐器演奏者必须使所有的音符完全相同协 调。 钢琴家们则不用操这份心，因为每个音符都已在那里等待着他们了。 给钢琴调音是调 音师的职责。 但调音师们也有他们的难处： 他们必须耐心地调理敲击琴弦的音锤，不能让 音锤发出的声音象是打击乐器，而且每个交叠的音都必须要清晰。如何得到乐章清晰的纹理 是学生指挥们所面临的难题：他们必须学会了解音乐中的每一个音及其发音之道。 他们还 必须致力于以热忱而又客观的权威去控制这些音符。除非是和音乐方面的知识和悟性结合起 来，单纯的技巧没有任何用处。 艺术家之所以伟大在于他们对音乐语言驾轻就熟，以致于 可以满怀喜悦地演出写于任何时代的作品。 >02 Schooling and Education It is commonly believed in the United States that school is where people go to get an education.Neverthele, it has been said that today children interrupt their education to go to school.The distinction between schooling and education implied by this remark is important.Education is much more open-ended and all-inclusive than schooling.Education knows no bounds.It can take place anywhere, whether in the shower or in the job, whether in a kitchen or on a tractor.It includes both the formal learning that takes place in schools and the whole universe of informal learning.The agents of education can range from a revered grandparent to thepeople debating politics on the radio, from a child to a distinguished scientist.Whereas schooling has a certain predictability, education quite often produces surprises.A chance conversation with a stranger may lead a person to discover how little is known of other religions.People are engaged in education from infancy on.Education, then, is a very broad, inclusive term.It is a lifelong proce, a proce that starts long before the start of school, and one that should be an integral part of one\'s entire life.Schooling, on the other hand, is a specific, formalized proce, whose general pattern varies little from one setting to the next.Throughout a country, children arrive at school at approximately the same time, take aigned seats, are taught by an adult, use similar textbooks, do homework, take exams, and so on.The slices of reality that are to be learned, whether they are the alphabet or an understanding of the workings of government, have usually been limited by the boundaries of the subject being taught.For example, high school students know that they are not likely to find out in their claes the truth about political problems in their communities or what the newest filmmakers are experimenting with.There are definite conditions surrounding the formalized proce of schooling.上学与受教育 在美国，人们通常认为上学是为了受教育。 而现在却有人认为孩子们上学打断了他们 受教育的过程。 这种观念中的上学与受教育之间的区别非常重要。 与上学相比，教育更具 开放性，内容更广泛。 教育不受任何限制。 它可以在任何场合下进行，在淋浴时，在工作 时，在厨房里或拖拉机上。 它既包括在学校所受的正规教育，也包括一切非正规教育。 传 授知识的人可以是德高望重的老者，可以是收音机里进行政治辩论的人们，可以是小孩子， 也可以是知名的科学家。 上学读书多少有点可预见性，而教育往往能带来意外的发现。 与 陌生人的一次随意谈话可能会使人认识到自己对其它宗教其实所知甚少。 人们从幼时起就 开始受教育。 因此，教育是一个内涵很丰富的词，它自始至终伴随人的一生，早在人们上 学之前就开始了。 教育应成为人生命中不可缺少的一部分。然而，上学却是一个特定的形 式化了的过程。 在不同场合下，它的基本形式大同小异。 在全国各地，孩子们几乎在同一 时刻到达学校，坐在指定的座位上，由一位成年人传授知识，使用大致相同的教材，做作业， 考试等等。 他们所学的现实生活中的一些片断，如字母表或政府的运作，往往受到科目范 围的限制。 例如，高中生们知道，在课堂上他们没法弄清楚他们社区里政治问题的真情， 也不会了解到最新潮的电影制片人在做哪些尝试。 学校教育这一形式化的过程是有特定的 限制的。
>03 The Definition of \"Price\" Prices determine how resources are to be used.They are also the means by which products and services that are in limited supply are rationed among buyers.The price system of the United States is a complex network composed of the prices of all the products bought and sold in the economy as well as those of a myriad of services, including labor, profeional, transportation, and public-utility services.The interrelationships of all these prices make up the\"system\" of prices.The price of any particular product or service is linked to a broad, complicated system of prices in which everything seems to depend more or le upon everything else.If one were to ask a group of randomly selected individuals to define \"price\", many would reply that price is an amount of money paid by the buyer to the seller of a product or service or, in other words, that price is the money value of a product or service as agreed upon in a market transaction.This definition is, of course, valid as far as it goes.For a complete understanding of a price in any particular transaction, much more than the amount of money involved must be known.Both the buyer and the seller should be familiar with not only the money amount, but with the amount and quality of the product or service to be exchanged, the time and place at which the exchange will take place and payment will be made, the form of money to be used, the credit terms and discounts that apply to the transaction, guarantees on the product or service, delivery terms, return privileges, and other factors.In other words, both buyer and seller should be fully aware of all the factors that comprise the total \"package\" being exchanged for the asked-for amount of money in order that they may evaluate a given price.\"价格\"的定义 价格决定资源的使用方式。 价格也是有限的产品与服务在买方中的配给 手段。 美国的价格系统是复杂的网状系统，包括经济生活中一切产品买卖的价格，也包括 名目繁多的各种服务，诸如劳动力、专职人员、交通运输、公共事业等服务的价格。 所有 这些价格的内在联系构成了价格系统。 任何一种个别产品或服务的价格都与这个庞大而复 杂的系统密切相关，而且或多或少地受到系统中其它成份的制约。如果随机挑选一群人，问 问他们如何定义\"价格\"，许多人会回答价格就是根据卖方提供的产品或服务，买方向其付出 的钱数。 换句话说，价格就是市场交易中大家认同的产品或服务的货币量。 该定义就其本 身来说自有其道理。 但要获得对价格在任何一桩交易中的完整认识，就必须考虑到大量\" 非货币\"因素的影响。 买卖双方不但要清楚交易中的钱数，而且要非常熟悉交易物的质量和 数量，交易的时间、地点，采用哪种形式付款，有怎样的缓付和优惠，对交易物的质量保证、交货条款、退赔权利等等。 也就是说，为了能估算索价，买卖双方必须通晓构成交易物价 格的通盘细节。 >04 Electricity The modern age is an age of electricity.People are so used to electric lights, radio, televisions, and telephones that it is hard to imagine what life would be like without them.When there is a power failure, people grope about in flickering candlelight, cars hesitate in the streets because there are no traffic lights to guide them, and food spoils in silent refrigerators.Yet, people began to understand how electricity works only a little more than two centuries ago.Nature has apparently been experimenting in this field for millions of years.Scientists are discovering more and more that the living world may hold many interesting secrets of electricity that could benefit humanity.All living cells send out tiny pulses of electricity.As the heart beats, it sends out pulses of record; they form an electrocardiogram, which a doctor can study to determine how well the heart is working.The brain, too, sends out brain waves of electricity, which can be recorded in an electroencephalogram.The electric currents generated by most living cells are extremely small -- often so small that sensitive instruments are needed to record them.But in some animals, certain muscle cells have become so specialized as electrical generators that they do not work as muscle cells at all.When large numbers of these cells are linked together, the effects can be astonishing.The electric eel is an amazing storage battery.It can send a jolt of as much as eight hundred volts of electricity through the water in which it lives.(An electric house current is only one hundred twenty volts.) As many as four-fifths of all the cells in the electric eel\'s body are specialized for generating electricity, and the strength of the shock it can deliver corresponds roughly to the length of its body.电 当今时代是电气时代。 人们对电灯、收音机、电视和电话早已司空见惯以致很难想 象没有它们生活会变成什么样。 当停电时，人们在摇曳不定的烛光下暗中摸索； 因没有红 绿灯的指示，汽车在道路上迟疑不前；冰箱也停止工作，导致食物变质。人们只是在两个世 纪前一点才开始了解电的使用原理，自然界却显然在这方面经历过了数百万年。 科学家不 断发现许多生物世界里可能有益于人类的关于电的有趣秘密。所有生物细胞都会发出微小的 电脉冲。 当心脏跳动时，把它发出的脉冲记录下来就成了心电图，这可让医生了解心脏的 工作状况。大脑也发出脑电波，这可在脑电图上记录下来。 许多生物细胞发出的电流都是 极微小的，小到要用灵敏仪器才能记录和测量。 但一些动物的某些肌肉细胞能转化成一个 个发电机，以致完全失去肌肉细胞的功能。 这种细胞大量地连接在一起时产生的效果将是 非常令人吃惊的。电鳗就是一种令人惊异的蓄电池。 它可以在水中发出相当于 800 伏特电 压电流(家庭用户的电压只有 120 伏特)。 在电鳗的身体里，多至五分之四的细胞都专门用 来发电，而且发出的电流的强度大约和它身体的长度成正比。
>05 The Beginning of Drama There are many theories about the beginning of drama in ancient Greece.The one most widely accepted today is based on the aumption that drama evolved from ritual.The argument for this view goes as follows.In the beginning, human beings viewed the natural forces of the worldas unpredictable, and they sought through various means to control these unknown and feared powers.Those measures which appeared to bring the desired results were then retained and repeated until they hardened into fixed rituals.Eventually stories arose which explained or veiled the mysteries of the rites.As time paed some rituals were abandoned, but the stories, later called myths, persisted and provided material for art and drama.Those who believe that drama evolved out of ritual also argue that those rites contained the seed of theater because music, dance, masks, and costumes were almost always used.Furthermore, a suitable site had to be provided for performances and when the entire community did not participate, a clear division was usually made between the \"acting area\" and the \"auditorium.\" In addition, there were performers, and, since considerable importance was attached to avoiding mistakes in the enactment of rites, religious leaders usually aumed that task.Wearing masks and costumes, they often impersonated other people, animals, or supernatural beings, and mimed the desired effect -- succe in hunt or battle, the coming rain, the revival of the Sun -- as an actor might.Eventually such dramatic representations were separated from religious activities.Another theory traces the theater\'s origin from the human interest in storytelling.According to this view tales (about the hunt, war, or other feats) are gradually elaborated, at first through the use of impersonation, action, and dialogue by a narrator and then through the aumption of each of the roles by a different person.A closely related theory traces theater to those dances that are primarily rhythmical and gymnastic or that are imitations of animal movements and sounds.戏剧的起源 关于古希腊戏剧的起源存在着多种理论，其中一个最普遍为人接受的理论 假设认为戏剧从仪式演化而来。 这个观点是这样进行论证的：一开始，人类把世界上的自 然力量，甚至季节的变化都看成是不可预料的。 他们试图通过各种方式去控制这些未知的、令人恐惧的力量。 那些似乎带来了满意结果的手段就被保留下来并且重复直到这些手段固 化为不变的仪式，最后产生了能够解释或者掩盖这些仪式神秘性的故事。 随着时间的推移， 一些仪式被废弃了，但这些后来被称作神话的故事流传下来并且为艺术和戏剧提供了素材。 认为戏剧从仪式演化而来的人们还认为那些仪式包含了戏剧的基本因素，因为音乐、舞蹈、面具和服装几乎经常被使用，而且，必须为演出提供一个合适的地点；如果不是整个社区共 同参加演出，经常在\"演出区\"和\"观众席\"之间划分出明显的分界。 另外，仪式中还有演员， 而且宗教领袖通常承担演出任务，因为在仪式的执行中避免错误的发生被认为有相当大的重 要性；他们经常带着面具，穿着服装象演员那样扮演其它人、动物或超自然的生灵，用动作 来表演以达到所需要的效果，比如打猎的成功或战斗的胜利、将至的雨、太阳的复活。 最 后这些戏剧性的表演从宗教活动中分离了出来。 另一个追溯戏剧起源的理论认为它来自人 们对叙述故事的兴趣。 根据这个观点，故事(关于狩猎、战争或者其它伟绩)是逐渐丰富起 来的。 首先通过一个讲解人来运用模仿、表演和对话，然后再由不同的人扮演各自的角色； 另一个与之紧密相关的理论将戏剧的起源追溯至舞蹈，这些舞蹈大体上是有节奏感的和体操 式的那一类，或者是对动物动作和声音的模仿。>06 Television Television -- the most pervasive and persuasive of modern technologies, marked by rapid change and growth -- is moving into a new era, an era of extraordinary sophistication and versatility, which promises to reshape our lives and our world.It is an electronic revolution of sorts, made poible by the marriage of television and computer technologies.The word \"television\", derived from its Greek (tele: distant) and Latin (visio: sight) roots, can literally be interpreted as sight from a distance.Very simply put, it works in this way: through a sophisticated system of electronics, television provides the capability of converting an image (focused on a special photoconductive plate within a camera) into electronic impulses, which can be sent through a wire or cable.These impulses, when fed into a receiver (television set), can then be electronically reconstituted into that same image.Television is more than just an electronic system, however.It is a means of expreion, as well as a vehicle for communication, and as such becomes a powerful tool for reaching other human beings.The field of television can be divided into two categories determined by its means of transmiion.First, there is broadcast television, which reaches the maes through broad-based airwave transmiion of television signals.Second, there is nonbroadcast television, which provides for the needs of individuals or specific interest groups through controlled transmiion techniques.Traditionally, television has been a medium of the maes.We are most familiar with broadcast television because it has been with us for about thirty-seven years in a form similar to what exists today.During those years, it has been controlled, for the most part, by the broadcast networks, ABC, NBC, and CBS, who have been the major purveyors of news, information, and entertainment.These giants of broadcasting have actually shaped not only television but our perception of it as well.We have come to look upon the picture tube as a source of entertainment, placing our role in this dynamic medium as the paive viewer.电视电视--以快速变化与发展为标志的最普遍、最具有影响力的一项现代技术，正在步 入一个极端复杂化与多样化的新时代。 这个时代承诺重新塑造我们的生活和我们的世界。 这可以称得上是又一次电子革命，其关键在于电视技术与计算机技术的结合。\"电视\"这个词 来源于希腊语词根(tele：远)和拉丁语词根(vision：景象)，可以从字面上理解为来自远处的 景象。 简单说来，电视是以这种方式工作的，通过一个复杂的电子系统，电视能够将一幅 图像(这幅图像被聚焦在一部摄像机内的一块特殊的光导底片上)转换成能经过导线或电缆 发送出去的电子脉冲信号。 当这些电子脉冲信号被输入一部接收机(电视机)时，就可以用 电子学的方法把脉冲信号重新恢复成同一幅图像。但是，电视不仅仅是一个电子系统，它还 是一种表达工具和传播渠道。 因此，电视成了一个对其他人发生影响的强大工具。电视这 个领域可以根据其发射方式分为两类。 第一类为广播电视，通过电视信号的宽带无线电波 发射展现在大众面前；第二类为非广播电视，使用受控的发射技术来满足个人以及某些特殊 利益群体的需要。电视早已成为大众媒介。 我们熟悉广播电视，因为广播电视已经以类似 目前的方式存在了大约 37 年。 在那些年头中，电视绝大部分一直由 ABC、NBC、CBS 这 些广播电视公司控制着，这些广播电视公司一直是新闻、信息和娱乐的主要提供者。 这些 广播业的巨头实际上不仅塑造了电视，而且也塑造了我们对电视的理解。 我们渐渐把显像 管看作是娱乐的来源，让自己成为这个生动的媒介的被动观众。 >07 Andrew Carnegie Andrew Carnegie, known as the King of Steel, built the steel industry in the United States, and, in the proce, became one of the wealthiest men in America.His succe resulted in part from his ability to sell the product and in part from his policy of expanding during periods of economic decline, when most of his competitors were reducing their investments.Carnegie believed that individuals should progre through hard work, but he also felt strongly that the wealthy should use their fortunes for the benefit of society.He opposed charity, preferring instead to provide educational opportunities that would allow others to help themselves.\"He who dies rich, dies disgraced, \" he often said.Among his more noteworthy contributions to society are those that bear his name, including the Carnegie Institute of Pittsburgh, which has a library, a museum of fine arts, and a museum of national history.He also founded a school of technology that is now part of Carnegie-Mellon University.Other philanthropic gifts are the Carnegie Endowment for International Peace to promote understanding between nations, the Carnegie Institute of Washington to fund scientific research, and Carnegie Hall to provide a center for the arts.Few Americans have been left untouched by Andrew Carnegie\'s generosity.His contributions of more than five million dollars established 2,500 libraries in small communities throughout the country and formed the nucleus of the public library system that we all enjoy today.安德鲁〃卡内基 被称作钢铁大王的安德鲁〃卡内基在美国建立了钢铁工业。 在这个过 程中，他变成了美国最富有的人之一。 他的成功，部分来自于他销售产品的能力，部分来 自于经济萧条时期的扩充策略。 在萧条时期，他的多数对手都在缩减投资。卡内基认为个 人应该通过努力工作来获得进展，但他也强烈地感到有钱人应该运用他们的财富来为社会谋 取福利。 他反对施舍救济，更愿意提供教育机会，使别人自立。 卡内基经常说：\"富有着 死去的人死得可耻。\"他对社会的较重要的贡献都以他的名字命名。 这些贡献包括匹兹堡卡 内基学校。 这个学校有一个图书馆，一个美术馆和一个国家历史博物馆；他还创立了一所 技术学校，这所学校现在是卡内基 梅隆大学的一部分；其他的慈善捐赠有为促进国家间了 解的\"卡内基国际和平基金\"，为科学研究提供经费的华盛顿卡内基学院以及给各种艺术活动 提供活动中心的卡内基音乐厅。安德鲁〃卡内基的慷慨大度几乎影响到每个美国人的生活。 由于他超过五百万美元的捐款，2500 个图书馆得以建立起来，遍布在美国各地的小村镇， 形成了我们今天还在享用的公共图书馆系统的核心。
>08 American Revolution The American Revolution was not a revolution in the sense of a radical or total change.It was not a sudden and violent overturning of the political and social framework, such as later occurred in France and Ruia, when both were already independent nations.Significant changes were ushered in, but they were not breathtaking.What happened was accelerated evolution rather than outright revolution.During the conflict itself people went on working and praying, marrying and playing.Most of them were not seriously disturbed by the actual fighting, and many of the more isolated communities scarcely knew that a war was on.America\'s War of Independence heralded the birth of three modern nations.One was Canada, which received its first large influx of English-speaking population from the thousands of loyalists who fled there from the United States.Another was Australia, which became a penal colony now that America was no longer available for prisoners and debtors.The third newcomer -- the United States -- based itself squarely on republican principles.Yet even the political overturn was not so revolutionary as one might suppose.In some states, notably Connecticut and Rhode Island, the war largely ratified a colonial self-rule already existing.British officials, everywhere ousted, were replaced by a home-grown governing cla, which promptly sought a local substitute for king and Parliament.美国革命 美国革命其实并不算是一场革命，因为它并未导致完全的和彻底的变化。 这 次革命并不是对政治和社会框架的一次突然和猛烈的颠覆，象后来在已经是独立国家的法国 和俄国所爆发的革命那样。 革命带来了重大的变化，但并非翻天覆地，所发生的只是进化 的加速，而不是一场彻底的革命；在冲突期间，人们仍然上班、做礼拜、结婚、玩耍。 多 数人并没有受到实际战斗的严重影响。 许多较闭塞的社区对这场战争几乎一无所知。美国 独立战争宣布了三个现代国家的诞生，其中一个是加拿大。 加拿大的第一大批讲英语的流 入人口来自于成千上万英王的效忠者， 这些人从美国逃到了加拿大。 另一个国家是澳大利 亚，因为美国不再是容纳罪犯和欠债者的国度了，澳大利亚就变成了一个惩治罪犯的殖民地
(注：独立战争前，英国政府将罪犯流放到美国)。 第三个国家就是美国，它完全建立在共 和原则基础上。即使政治上的颠覆也不如人们可能想象的那样具有革命性。 在一些州，特 别是康涅狄格和罗德岛，战争基本上只是承认了已经存在的殖民地的自治。 四处被驱逐的 英国官员都被本土的统治阶级所替代，这个统治阶级迅速地以地方权力机关来替代国王和议 会。 >09 Suburbanization If by \"suburb\" is meant an urban margin that grows more rapidly than its already developed interior, the proce of suburbanization began during the emergence of the industrial city in the second quarter of the nineteenth century.Before that period the city was a small highly compact cluster in which people moved about on foot and goods were conveyed by horse and cart.But the early factories built in the 1830\'s and 1840\'s were located along waterways and near railheads at the edges of cities, and housing was needed for the thousands of people drawn by the prospect of employment.In time, the factories were surrounded by proliferating mill towns of apartments and row houses that abutted the older, main cities.As a defense against this encroachment and to enlarge their tax bases, the cities appropriated their industrial neighbors.In 1854, for example, the city of Philadelphia annexed most of Philadelphia County.Similar municipal maneuvers took place in Chicago and in New York.Indeed, most great cities of the United States achieved such status only by incorporating the communities along their borders.With the acceleration of industrial growth came acute urban crowding and accompanying social stre -- conditions that began to approach disastrous proportions when, in 1888, the first commercially succeful electric traction line was developed.Within a few years the horse-drawn trolleys were retired and electric streetcar networks cricroed and connected every major urban area, fostering a wave of suburbanization that transformed the compact industrial city into a dispersed metropolis.This first phase of ma-scale suburbanization was reinforced by the simultaneous emergence of the urban Middle Cla, whose desires for homeownership in neighborhoods far from the aging inner city were satisfied by the developers of single-family housing tracts.郊区的发展 如果\"郊区\"指的是比已建好的城市内部发展更为迅速的城市边缘地带，那 么郊区化可以说始于 1825 年至 1850 年工业化城市出现期间。 在这之前，城市只是高度密 集的小聚居群。 在其中，人们步行走动，商品靠马车来运送。 但是建于 18 世纪三四十年 代的早期工厂位于城边的航道和铁路附近，被工作机会吸引到这里的成千上万的人们需要住 房。 渐渐地，在与旧有的主要城区相毗邻的地方，不断涌现出由排房和公寓楼组成的工人 聚居区，包围了工厂。作为对这种侵蚀的自卫，也为了扩大它们收税的地域范围，城市吞并 了工业化的临近地带，比如 1854 年费城的城区就兼并了费县的绝大部分地区。 相似的城市 化也发生在芝加哥和纽约。 今天很多美国的大城市其实就是靠吞并它们附近的边缘地区而 变成大都会的。随着工业化的加速发展，城市里出现了严重拥挤和相伴而来的社会压力。 当1888 年第一条商业上成功的电气化铁轨被制造出来时，压力开始接近危机的程度。 几年之
内，马车就被废弃了，电车网相互交织连接着各个重要的城区，从而形成了一种郊区化的潮 流，即密集的工业城市转变成了分散的都市。 此时城市中产阶级的出现进一步加强了第一 波大规模郊区化。 这些中产阶级希望在远离老旧城市的地区拥有住宅，单一家庭住宅地区 的开发者满足了他们的愿望。 >10 Types of Speech Standard usage includes those words and expreions understood, used, and accepted by a majority of the speakers of a language in any situation regardle of the level of formality.As such, these words and expreions are well defined and listed in standard dictionaries.Colloquialisms, on the other hand, are familiar words and idioms that are understood by almost all speakers of a language and used in informal speech or writing, but not considered appropriate for more formal situations.Almost all idiomatic expreions are colloquial language.Slang, however, refers to words and expreions understood by a large number of speakers but not accepted as good, formal usage by the majority.Colloquial expreions and even slang may be found in standard dictionaries but will be so identified.Both colloquial usage and slang are more common in speech than in writing.Colloquial speech often paes into standard speech.Some slang also paes into standard speech, but other slang expreions enjoy momentary popularity followed by obscurity.In some cases, the majority never accepts certain slang phrases but neverthele retains them in their collective memories.Every generation seems to require its own set of words to describe familiar objects and events.It has been pointed out by a number of linguists that three cultural conditions are neceary for the creation of a large body of slang expreions.First, the introduction and acceptance of new objects and situations in the society; second, a diverse population with a large number of subgroups; third, aociation among the subgroups and the majority population.Finally, it is worth noting that the terms \"standard\" \"colloquial\" and \"slang\" exist only as abstract labels for scholars who study language.Only a tiny number of the speakers of any language will be aware that they are using colloquial or slang expreions.Most speakers of English will, during appropriate situations, select and use all three types of expreions.语言的类型 标准用法包括那些为使用这种语言的大多数人在任何场合下理解、使用和 接受的词和短语，而不论该场合是否正式。 这些词和短语的意义已很确定并被列入了标准 词典中。 相反，俗语是指那些几乎所有讲这种语言的人都理解并在非正式的口头或书面中 使用，却不适用于更正规的一些场合的词和短语。 几乎所有的习惯用语都属于俗语，而俚 语指的是为很多讲这种语言的人理解但大多数人不把它们列入好的、正式用法之内的词和短 语；俗语甚至俚语都可能在标准字典中查到，但是字典中会标明它们的性质。 俗语和俚语 词汇的应用都是口头较多、笔头较少。俗语用法经常地被接受为标准用法。 一些俚语也变 成了标准用法，但另外一些俚语只经历了短暂的流行，而后就被弃之不用了。 有时候，多 数人从来不接受某些俚语，但是他们把这些俚语保存到集中记忆中。 每一代人似乎都需要 独有的一套词汇来描述熟知的物体和事件。 很多语言学家指出，大量俚语的形成需要三个 文化条件：第一，对社会中新事物的引入和接受；第二，一个由大量子群构成的多样化人口； 第三，各子群与多数人口之间的联系。最后需要提到的是，\"标准语\"、\"俗语\"和\"俚语\"这些 术语只是对研究语言的专家才有用的抽象标签。 不论何种语言，只会有很小一部分使用者 能够意识到他们是在使用俗语或俚语。 讲英语的多数人能够在适当的场合中选择使用所有 这三种语言类型。 >11 Archaeology Archaeology is a source of history, not just a humble auxiliary discipline.Archaeological data are historical documents in their own right, not mere illustrations to written texts.Just as much as any other historian, an archaeologist studies and tries to reconstitute the proce that has created the human world in which we live -- and us ourselves in so far as we are each creatures of our age and social environment.Archaeological data are all changes in the material world resulting from human action or, more succinctly, the foilized results of human behavior.The sum total of these constitutes what may be called the archaeological record.This record exhibits certain peculiarities and deficiencies the consequences of which produce a rather superficial contrast between archaeological history and the more familiar kind based upon written records.Not all human behavior foilizes.The words I utter and you hear as vibrations in the air are certainly human changes in the material world and may be of great historical significance.Yet they leave no sort of trace in the archaeological records unle they are captured by a dictaphone or written down by a clerk.The movement of troops on the battlefield may \"change the course of history,\" but this is equally ephemeral from the archaeologist\'s standpoint.What is perhaps worse, most organic materials are perishable.Everything made of wood, hide, wool, linen, gra, hair, and similar materials will decay and vanish in dust in a few years or centuries, save under very exceptional conditions.In a relatively brief period the archaeological record is reduced to mere scraps of stone, bone, gla, metal, and earthenware.Still modern archaeology, by applying appropriate techniques and comparative methods, aided by a few lucky finds from peat-bogs, deserts, and frozen soils, is able to fill up a good deal of the gap.考古学
考古学是历史学的一个来源，而不是地位卑微的辅助学科。 考古学资料本身也是一种 历史文献，而不仅仅是文字资料的例证。 正象任何一位历史学家那样，考古学家研究调查 并尽力去重构一个过程。 这个过程创造了我们生活的人类世界，也创造了我们自身，因为 我们都是我们所处的时代和社会环境的产物。 考古学的资料就是人类行为所造成的物质变 化。 更简洁地说，是石化了的人类行为。 这些变化的总和构成了我们所说的考古学记录。 这些记录自有其独特和不足之处，因而导致人们对考古历史和更熟悉的文字记载历史进行相 当肤浅的对比。并不是所有的人类行为都留下化石。 我说的话，你通过空气振动听见，这 当然是人类造成的物质变化，也可能有重大的历史意义，但这些话在考古学中未留下丝毫痕 迹，除非有人用录音机录下来或文书把这些话写了下来。 战场上军队的行动可能\"改变历史 的进程\"，但从考古学的观点来看，这同样是难以捕捉的；可能更糟的是，多数有机物质会 腐烂。 任何由木头、生皮、绒线、亚麻、草、毛发以及相似物质做成的东西除非在一些非 常特殊的条件下，几年或几个世纪以后，会在尘土中腐烂并消失。 在短时期内，能留下考 古记录的东西也都会退化为石头、骨头、玻璃、金属和陶器的碎片。 然而，现代考古学通 过运用适当的技术和比较的方法，在从泥炭、沙漠和冻土中所获得的一些幸运发现的辅助下， 能够填充这个空缺的很大部分。 >12 Museums From Boston to Los Angeles, from New York City to Chicago to Dallas, museums are either planning, building, or wrapping up wholesale expansion programs.These programs already have radically altered facades and floor plans or are expected to do so in the not-too-distant future.In New York City alone, six major institutions have spread up and out into the air space and neighborhoods around them or are preparing to do so.The reasons for this confluence of activity are complex, but one factor is a consideration everywhere -- space.With collections expanding, with the needs and functions of museums changing, empty space has become a very precious commodity.Probably nowhere in the country is this more true than at the Philadelphia Museum of Art, which has needed additional space for decades and which received its last significant facelift ten years ago.Because of the space crunch, the Art Museum has become increasingly cautious in considering acquisitions and donations of art, in some cases paing up opportunities to strengthen its collections.Deacceing -- or selling off -- works of art has taken on new importance because of the museum\'s space problems.And increasingly, curators have been forced to juggle gallery space, rotating one masterpiece into public view while another is sent to storage.Despite the clear need for additional gallery and storage space, however, \"the museum has no plan, no plan to break out of its envelope in the next fifteen years,\" according to Philadelphia Museum of Art\'s president.博物馆 从波士顿到洛杉机，从纽约到芝加哥、到达拉斯，所有的博物馆或者正在筹划、建造或
者正在完成大规模的扩建计划。 这些计划或者已经根本性地改变了博物馆门面与展厅的设 计，或者预期在不久的将来会这样做。 单单在纽约市，六个主要机构或者已经向空中和周 围扩展，或者正准备这样做。大家一致行动的原因是复杂多样的，但其中的一个因素是普遍 考虑的空间问题。 随着收藏品的增多，也随着博物馆的需要和功能的变化，空间已经变成 了一项非常珍贵的商品。在我国，也许没有任何其他地方比费城艺术博物馆更符合这个事实。 这个博物馆几十年来一直需要额外的空间，十年前进行了最后一次重大的翻新。 由于空间 紧缺，该艺术博物馆在考虑购买与受赠艺术品已越来越谨慎，有时甚至放弃增强艺术收藏的 机会。由于博物馆的空间问题，将艺术品脱手或者说卖掉已经有了新的重要意义。 博物馆 馆长们被迫巧妙轮换利用陈列馆的空间，轮流着把一些艺术杰作向公众展出，而把另一些送 入存储室中。虽然对额外的陈列室和存储室空间需要很明显，但据费城艺术博物馆经理讲：\"博物馆还没有在未来十五年打破这个束缚的计划。\" >13 Skyscrapers and Environment In the late 1960\'s, many people in North America turned their attention to environmental problems, and new steel-and-gla skyscrapers were widely criticized.Ecologists pointed out that a cluster of tall buildings in a city often overburdens public transportation and parking lot capacities.Skyscrapers are also lavish consumers, and wasters, of electric power.In one recent year, the addition of 17 million square feet of skyscraper office space in New York City raised the peak daily demand for electricity by 120, 000 kilowatts -- enough to supply the entire city of Albany, New York, for a day.Gla-walled skyscrapers can be especially wasteful.The heat lo (or gain) through a wall of half-inch plate gla is more than ten times that through a typical masonry wall filled with insulation board.To leen the strain on heating and air-conditioning equipment, builders of skyscrapers have begun to use double-glazed panels of gla, and reflective glaes coated with silver or gold mirror films that reduce glare as well as heat gain.However, mirror-walled skyscrapers raise the temperature of the surrounding air and affect neighboring buildings.Skyscrapers put a severe strain on a city\'s sanitation facilities, too.If fully occupied, the two World Trade Center towers in New York City would alone generate 2.25 million gallons of raw sewage each year -- as much as a city the size of Stanford, Connecticut, which has a population of more than 109, 000.摩天大楼与环境
60 年代后期，许多北美人把注意力转向了环境问题，那些崭新的玻璃钢摩天大楼受到 了广泛的批评。 生态学家指出，城市中密集的高层建筑经常给公共交通与停车场的承载能 力造成过重的负担。摩天大楼还是电能的过度消费者与浪费者。 最近的某一年，纽约市摩 天写字楼 1，700 万英尺办公面积的增加使电能的最高日需求量提高了 120，000 千瓦。 这 些电能足以供纽约的整个奥尔巴尼市使用一天。玻璃表面的摩天大楼特别地浪费。 通过半 英寸的平板玻璃墙壁损失(或增加)的热量是典型的加入绝缘板的石墙所允许的热量损失(或 增加)的十倍以上。 为了减轻取暖设备或空调设备的压力，摩天大楼的建造者们已经开始使 用双面上釉的玻璃镶板和涂上了金色或银色反光薄膜的反光玻璃，来减少强光照射和热量的 增加；但是，镜面的摩天大楼会提高周围空气的温度并会对附近的建筑物产生影响。摩天大 楼也对城市的卫生设施造成了沉重的压力。 单单纽约市的二个世界贸易中心大楼如果完全 被占满的话，每年就会产生 2，250，000 加仑的污水。 这相当于康涅狄格州的斯坦福市这 样大的城市一年所产生的污水量，而康州的斯坦福市拥有 109，000 人口。 >14 A Rare Foil Record The preservation of embryos and juveniles is a rate occurrence in the foil record.The tiny, delicate skeletons are usually scattered by scavengers or destroyed by weathering before they can be foilized.Ichthyosaurs had a higher chance of being preserved than did terrestrial creatures because, as marine animals, they tended to live in environments le subject to erosion.Still, their foilization required a suite of factors: a slow rate of decay of soft tiues, little scavenging by other animals, a lack of swift currents and waves to jumble and carry away small bones, and fairly rapid burial.Given these factors, some areas have become a treasury of well-preserved ichthyosaur foils.The deposits at Holzmaden, Germany, present an interesting case for analysis.The ichthyosaur remains are found in black, bituminous marine shales deposited about 190 million years ago.Over the years, thousands of specimens of marine reptiles, fish and invertebrates have been recovered from these rocks.The quality of preservation is outstanding, but what is even more impreive is the number of ichthyosaur foils containing preserved embryos.Ichthyosaurs with embryos have been reported from 6 different levels of the shale in a small area around Holzmaden, suggesting that a specific site was used by large numbers of ichthyosaurs repeatedly over time.The embryos are quite advanced in their physical development; their paddles, for example, are already well formed.One specimen is even preserved in the birth canal.In addition, the shale contains the remains of many newborns that are between 20 and 30 inches long.Why are there so many pregnant females and young at Holzmaden when they are so rare elsewhere? The quality of preservation is almost unmatched and quarry operations have been carried out carefully with an awarene of the value of the foils.But these factors do not account for the interesting question of how there came to be such a concentration of pregnant ichthyosaurs in a particular place very close to their time of giving birth.罕见的化石记录 胚胎与幼体被保存下来在化石记录中是少见的事情。微小纤细的骨骼 通常在石化前就被食腐肉的动物拆散了，或者被风化作用破坏掉了。 鱼龙比起陆地的动物 有更大的几率被保存下来，因为它们作为海洋动物常生活在腐蚀性较小的环境中。 但是它 们的石化需要一系列因素：软组织的腐烂速度缓慢，很少被其他动物残食，缺少混杂、冲走 小骨头的快速水流和波浪，以及相当快地被掩埋。 当这些因素存在时，某些地区就会变成 一个充满保存完好的鱼龙化石的宝库。在德国获尔兹梅登，那儿的沉积物给人们提出了一个 有趣的分析案例。 人们在黑色的、含沥青的海洋页岩中发现了约 19，000 年前沉积下来的 鱼龙化石。 几年时间内，在这些岩石中取得了数以千计的海洋爬行动物、鱼类以及无脊椎 动物的标本。 它们的保存质量非常的好，但更令人称奇的是保存下来的育有胚胎的鱼龙化 石数目。 在获尔兹梅登附近一个小地区的六个不同的页岩层中分别发现了育有胚胎的鱼龙 化石。 这表明大量的鱼龙经年累月重复使用一个特定的地点。 那些胚胎已经发育得相当完 整了。 比如，它们的蹼桨已经完全形成了。 有一个标本甚至被保存在产道中。 而且，那 块页岩包含着很多在 20 到 30 英寸之间的新生幼体的化石。为什么在其他地方那么稀少的怀 孕雌兽和幼体在获尔兹梅登却那么多呢? 因为其保存质量几乎举世无双，采集工作的进行一 直是一丝不苟的。 大家都认识到这些化石的价值极其珍贵，但这些因素并不能解释这个有 趣的问题： 为什么在一个特定的地点会如此集中地出现即将临产的怀孕鱼龙群呢? >15 The Nobel Academy For the last 82 years, Sweden\'s Nobel Academy has decided who will receive the Nobel Prize in Literature, thereby determining who will be elevated from the great and the near great to the immortal.But today the Academy is coming under heavy criticism both from the without and from within.Critics contend that the selection of the winners often has le to do with true writing ability than with the peculiar internal politics of the Academy and of Sweden itself.According to Ingmar Bjorksten, the cultural editor for one of the country\'s two major newspapers, the prize continues to represent \"what people call a very Swedish exercise: reflecting Swedish tastes.\" The Academy has defended itself against such charges of provincialism in its selection by aerting that its physical distance from the great literary capitals of the world actually serves to protect the Academy from outside influences.This may well be true, but critics respond that this very distance may also be responsible for the Academy\'s inability to perceive accurately authentic trends in the literary world.Regardle of concerns over the selection proce, however, it seems that the prize will continue to survive both as an indicator of the literature that we most highly praise, and as an elusive goal that writers seek.If for no other reason, the prize will continue to be desirable for the financial rewards that accompany it; not only is the cash prize itself considerable, but it also dramatically increases sales of an author\'s books.诺贝尔委员会
过去的 82 年里，瑞典的诺贝尔委员会决定了谁将获得诺贝尔文学奖，因此也就决定了 谁将从伟大或近乎伟大荣升为不朽。 但在今天，该委员会却遭到了评选委员会内外的猛烈 批评。 批评者们争论说：\"评选获奖者时，起作用更大的不是真实的写作能力，而是该委员 会以及瑞典特有的内部政治。 按照瑞典两家主要报纸之一的文化版编辑 Ingmar Bjorksten 的说法，该文学奖仍然是\"人们所说的一种非常瑞典式的做为：反映瑞典口味\"。对于其评选 过程中目光短浅的指责，该委员会辩护说，该委员会与世界几大文学之都相距遥远，实际上 使该委员会免受外来的干扰。 这也许是对的，但批评者们反驳说，也正因为相距如此遥远， 该委员会才不能准确地把握文学界的真正趋势。尽管对评选程序存在着关注，该文学奖将继 续作为世人最为推崇的文学的标志而存在，并将继续是作家们难以达到却又会不断追逐的目 标。 如果不考虑其他因素，而仅仅考虑与之俱来的经济利益，该奖也将继续为人所渴求： 这不仅因为该奖本身就是一笔可观的现金收入，而且该奖还将极大地增加一个作家的著作的 销量。 >16 The War between Britain and France In the late eighteenth century, battles raged in almost every corner of Europe, as well as in the Middle East, South Africa, the West Indies, and Latin America.In reality, however, there was only one major war during this time, the war between Britain and France.All other battles were ancillary to this larger conflict, and were often at least partially related to its antagonists\' goals and strategies.France sought total domination of Europe.This goal was obstructed by British independence and Britain\'s efforts throughout the continent to thwart Napoleon; through treaties, Britain built coalitions (not diimilar in concept to today\'s NATO) guaranteeing British participation in all major European conflicts.These two antagonists were poorly matched, insofar as they had very unequal strengths: France was predominant on land, Britain at sea.The French knew that, short of defeating the British navy, their only hope of victory was to close all the ports of Europe to British ships.Accordingly, France set out to overcome Britain by extending its military domination from Moscow to Lisbon, from Jutland to Calabria.All of this entailed tremendous risk, because France did not have the military resources to control this much territory and still protect itself and maintain order at home.French strategists calculated that a navy of 150 ships would provide the force neceary to defeat the British navy.Such a force would give France a three-to-two advantage over Britain.This advantage was deemed neceary because of Britain\'s superior sea skills and technology, and also because Britain would be fighting a defensive war, allowing it to win with fewer forces.Napoleon never lost sight of his goal, because Britain represented the last substantial impediment to his control of Europe.As his force neared that goal, Napoleon grew increasingly impatient and began planning an immediate attack.英法战争
在 18 世纪后期，战争爆发于欧洲大陆的几乎每一个角落，在中东、南非、西印度群岛、拉丁美洲亦都是如此。 然而实际上，在这一时期只有一场主要的战争，那就是英法之间的 战争。 所有其他战争都服从于这一更大的争端，至少是与这两个对手的目标和战略有某些 关联。 法国力图统治整个欧洲，而英国的自主及其力图在整个欧洲大陆挫败拿破仑的种种 努力都是法国实现这一目标的障碍。英国通过条约建立了联盟(和今天北约的概念没有什么 不同)以保证英国插手所有欧洲的主要争端。 这两个对头并不是一对好对手，因为他们的力 量极不均衡：法兰西在陆地上称王，英格兰则在海上称霸。 法国人明白，如果不能击败英 国海军，他们胜利的唯一希望就是让欧洲的所有港口都对英国舰船关闭。 于是，法国将其 军事占领从莫斯科延伸到里斯本，从尤特兰延伸到卡拉布里亚，企图以此来制服英国。 所 有这些行动包含着巨大的风险，因为法国并不具备足够的军事资源，来控制这么多地盘，同 时又能保护自己，维持国内的秩序。法国战略家们的算盘是，其海军若拥有 150 艘军舰，则 将足以击跨英国海军。 这样的武力将使法国对英国具有 3 比 2 的优势。 这种优势被认为是 必不可少的，因为英国人具有超群的海上技能和技术，并且打的是一场防御战争，使它能以 少胜多。 拿破仑从未忘却他的目标，因为英国是他统治全欧的最后一个重大的障碍。 随着 他的力量越来越靠近这个目标，拿破仑变得越来越不耐烦起来，开始策划立即攻击。
>17 Evolution of Sleep Sleep is very ancient.In the electroencephalographic sense we share it with all the primates and almost all the other mammals and birds: it may extend back as far as the reptiles.There is some evidence that the two types of sleep, dreaming and dreamle, depend on the life-style of the animal, and that predators are statistically much more likely to dream than prey, which are in turn much more likely to experience dreamle sleep.In dream sleep, the animal is powerfully immobilized and remarkably unresponsive to external stimuli.Dreamle sleep is much shallower, and we have all witneed cats or dogs cocking their ears to a sound when apparently fast asleep.The fact that deep dream sleep is rare among prey today seems clearly to be a product of natural selection, and it makes sense that today, when sleep is highly evolved, the stupid animals are le frequently immobilized by deep sleep than the smart ones.But why should they sleep deeply at all? Why should a state of such deep immobilization ever have evolved? Perhaps one useful hint about the original function of sleep is to be found in the fact that dolphins and whales and aquatic mammals in general seem to sleep very little.There is, by and large, no place to hide in the ocean.Could it be that, rather than increasing an animal\'s vulnerability, the function of sleep is to decrease it? Wilse Webb of the University of Florida and Ray Meddis of London University have suggested this to be the case.It is conceivable that animals who are too stupid to be quiet on their own initiative are, during periods of high risk, immobilized by the implacable arm of sleep.The point seems particularly clear for the young of predatory animals.This is an interesting notion and probably at least partly true.睡眠的进化 睡眠是古老的。 从脑电图上看，我们人类和所有灵长目动物以及几乎所有的哺乳动物 和鸟类都一样需要睡眠；甚至爬行类动物也有睡眠。 有证据显示，有梦睡眠和无梦睡眠这
两种类型的睡眠取决于该动物的生活方式。 从统计上看，食肉动物比被捕食动物有更多的 有梦睡眠，而被捕食动物更多地无梦睡眠。 动物在有梦睡眠时，被有效地解除动作能力， 并且对外界刺激缺乏反应。 无梦睡眠则要浅得多。 我们都看到过猫和狗在显然的酣睡中， 有一点响动耳朵就会竖起来。 被捕食动物很少有深度的有梦睡眠，这看来显然是自然选择 的结果。 而且这一点是有道理的：当睡眠高度进化以后，愚笨的动物比聪明的动物更少在 深度睡眠状态下丧失动作能力。 但是动物为什么要进入深度睡眠呢?为什么这样的无动作状 态也会进化出来呢? 海豚、鲸鱼以及水生哺乳动物睡眠都极少，这一事实可以给睡眠的根本 功能提供有用的线索。 海洋中是没有藏身之处的。 会不会是这样，睡眠不但不增加动物受 伤害的可能性，反而是减少了这种可能性呢?佛罗里达大学的 Wilse Webb 和伦敦大学的 Ray Meddis 认为情况就是如此。 可以想像得出，在危险的时刻，那些由于太愚笨而不能自动保 持安静的动物，会不由自主地变得动弹不得。 这一点在食肉动物的幼兽身上表现得特别明 显。 这是一个很有意思的看法，它至少部分是正确的。
>18 Modern American Universities Before the 1850\'s, the United States had a number of small colleges, most of them dating from colonial days.They were small, church connected institutions whose primary concern was to shape the moral character of their students.Throughout Europe, institutions of higher learning had developed, bearing the ancient name of university.In Germany a different kind of university had developed.The German university was concerned primarily with creating and spreading knowledge, not morals.Between midcentury and the end of the 1800\'s, more than nine thousand young Americans, diatisfied with their training at home, went to Germany for advanced study.Some of them returned to become presidents of venerable colleges -- Harvard, Yale, Columbia -- and transform them into modern universities.The new presidents broke all ties with the churches and brought in a new kind of faculty.Profeors were hired for their knowledge of a subject, not because they were of the proper faith and had a strong arm for disciplining students.The new principle was that a university was to create knowledge as well as pa it on, and this called for a faculty composed of teacher-scholars.Drilling and learning by rote were replaced by the German method of lecturing, in which the profeor\'s own research was presented in cla.Graduate training leading to the Ph.D., an ancient German degree signifying the highest level of advanced scholarly attainment, was introduced.With the establishment of the seminar system, graduate students learned to question, analyze, and conduct their own research.At the same time, the new university greatly expanded in size and course offerings, breaking completely out of the old, constricted curriculum of mathematics, claics, rhetoric, and music.The president of Harvard pioneered the elective system, by which students were able to choose their own courses of study.The notion of major fields of study emerged.The new goal was to make the university relevant to the real pursuits of the world.Paying close heed to the practical needs of society, the new universities trained men and women to work at its tasks, with engineering students being the most characteristic of the new regime.Students were also trained as economists, architects, agriculturalists, social welfare workers, and teachers.现代美国大学19 世纪 50 年代以前美国有一些小的学院，大多数成立于殖民时期。 它们是与教会挂
钩的小机构，主要目的是培养学生的道德品行。 当时在欧洲各地，高等教育机构已经发展 起来，用的是一个古老的名称--大学。 德国已经发展出一种不同类型的大学。 德国大学关 心的主要是创造知识和传播知识，而不是道德教育。 从世纪中叶到世纪末，有 9000 多名美 国青年因不满国内所受的教育而赴德深造。 他们中的一些人回国后成为一些知名学府--哈 佛、耶鲁、哥伦比亚的校长并且把这些学府转变成了现代意义的大学。 新校长们断绝了和 教会的关系，聘请了新型的教职员，聘用教授根据的是他们在学科方面的知识，而不是正确 的信仰和约束学生的强硬手段。 新的原则是大学既要传播知识也要创造知识。 这就需要由 学者型老师组成教工队伍。 靠死记硬背和做练习来学习的方法变为德国式的讲解方法。 德 国式的讲解就是由教授讲授自己的研究课题。 通过研究生性质的学习可以获得表明最高学 术造诣的古老的德国学位--博士学位。 随着讨论课制度的建立，研究生们学会了提问、分 析以及开展他们自己的研究。 同时，新式大学学校规模和课程设臵完全突破了过去那种只 有数学、经典著作、美学和音乐的狭窄课程表。 哈佛大学的校长率先推出选课制度，这样 学生们就能选择自己的专业。主修领域的概念也出现了。新的目标是使大学对实际社会更有 用。 密切关注着社会上的实际需求，新的大学着意培养学生解决问题的能力。 工程系学生 成为新式教育体制下最典型的学生。学生们还被培训成为经济学家、建筑师、农学家、社会 工作人员以及教师。 >19 Children\'s Numerical Skills People appear to be born to compute.The numerical skills of children develop so early and so inexorably that it is easy to imagine an internal clock of mathematical maturity guiding their growth.Not long after learning to walk and talk, they can set the table with impreive accuracy -- one knife, one spoon, one fork, for each of the five chairs.Soon they are capable of noting that they have placed five knives, spoons and forks on the table and, a bit later, that this amounts to fifteen pieces of silverware.Having thus mastered addition, they move on to subtraction.It seems almost reasonable to expect that if a child were secluded on a desert island at birth and retrieved seven years later, he or she could enter a second-grade mathematics cla without any serious problems of intellectual adjustment.Of course, the truth is not so simple.This century, the work of cognitive psychologists has illuminated the subtle forms of daily learning on which intellectual progre depends.Children were observed as they slowly grasped -- or, as the case might be, bumped into -- concepts that adults take for granted, as they refused, for instance, to concede that quantity is unchanged as water pours from a short stout gla into a tall thin one.Psychologists have since demonstrated that young children, asked to count the pencils in a pile, readily report the number of blue or red pencils, but must be coaxed into finding the total.Such studies have suggested that the rudiments of mathematics are mastered gradually, and with effort.They have also suggested that the very concept of abstract numbersis itself far from innate.儿童的数学能力
人似乎生来就会计算。 孩子们使用数字的技能发展得如此之早和如此必然，很容易让 人想象有一个内在的精确而成熟的数字钟在指导他们的成长。 孩子们在学会走路和说话后 不久，就能以令人惊叹的准确布臵桌子--五把椅子前面分别摆上一把刀、一个汤匙、一把叉 子。 很快地，他们就能知道他们已在桌面上摆放了五把刀、五个汤匙、五把叉子。 没有多 久，他们就又能知道这些东西加起来总共是 15 把银餐具。 如此这般地掌握了加法之后，他 们又转向减法。 有一种设想几乎顺理成章，那就是，即使一个孩子一出生就被隔绝到荒岛 上，七年后返回世间，也能直接上小学二年级的数学课，而不会碰到任何智力调整方面的大 麻烦。当然，事实并没有这么简单。 本世纪认知心理学家的工作已经揭示了智力发展所依 赖的日常学习的微妙形式。 他们观察到孩子们缓慢掌握那些成年人认为理所当然的概念的 过程，或者是孩子们偶然遇到这些概念的过程。 他们也观察到孩子们拒绝承认某些常识的 情况。 比如： 孩子们拒绝承认当水从短而粗的瓶中倒入细而长的瓶子中时，水的数量没有 变化。 心理学家们而后又展示一个例子， 即：让孩子们数一堆铅笔时，他们能顺利地报出 蓝铅笔或红铅笔的数目，但却需诱导才能报出总的数目。 此类研究表明：数学基础是经过 逐渐努力后掌握的。 他们还表示抽象的数字概念，如可表示任何一类物品并且是在做比摆 桌子有更高数学要求的任何事时都必备的
一、
二、三意识，远远不是天生就具备的。>20 The Historical Significance of American Revolution The ways of history are so intricate and the motivations of human actions so complex that it is always hazardous to attempt to represent events covering a number of years, a multiplicity of persons, and distant localities as the expreion of one intellectual or social movement; yet the historical proce which culminated in the ascent of Thomas Jefferson to the presidency can be regarded as the outstanding example not only of the birth of a new way of life but of nationalism as a new way of life.The American Revolution represents the link between the seventeenth century, in which modern England became conscious of itself, and the awakening of modern Europe at the end of the eighteenth century.It may seem strange that the march of history should have had to cro the Atlantic Ocean, but only in the North American colonies could a struggle for civic liberty lead also to the foundation of a new nation.Here, in the popular rising against a \"tyrannical\" government, the fruits were more than the securing of a freer constitution.They included the growth of a nation born in liberty by the will of the people, not from the roots of common descent, a geographic entity, or the ambitions of king or dynasty.With the American nation, for the first time, a nation was born, not in the dim past of history but before the eyes of the whole world.美国革命的历史意义 历史的进程是如此错综复杂，人类行为的动机是如此令人费解，以至于想把那些时间跨
度大，涉及人数多，空间范围广的事件描述成为一个智者或一场社会运动的表现的企图是危 险的。 然而以托马斯〃杰弗逊登上总统宝座为高潮的那一段历史过程可以被视为一个特殊 的例子。 在这段历史时期里不仅诞生了新的生活方式，而且民族主义成为了一种新的生活 方式。 美国独立战争成为联结 17 世纪现代英格兰的自我意识和 18 世纪末现代欧洲的觉醒 的纽带。 历史的行程需要跨越大西洋，这看起来似乎有些奇怪，但却只有在北美殖民地为 民权和自由的斗争才能导致新国家的建立。 这里，反对\"暴政\"的民众起义的成果不仅是获 得一个包含更多自由的宪法，还包括了一个依照人民的意愿诞生在自由中的国家的成长。这 个国家不是基于血缘、地理、君主或王朝的野心。 由于有了美国，第一次一个国家的诞生
不是发生在历史模糊的过去，而是在全世界人们的眼前。 >21 The Origin of Sports When did sport begin? If sport is, in eence, play, the claim might be made that sport is much older than humankind, for, as we all have observed, the beasts play.Dogs and cats wrestle and play ball games.Fishes and birds dance.The apes have simple, pleasurable games.Frolicking infants, school children playing tag, and adult arm wrestlers are demonstrating strong, transgenerational and tranpecies bonds with the universe of animalsliturgy, literature, and lawand the accumulated knowledge of tens of thousands of years of experience and intimacy with plants in the wild would begin to fade away.植物学
植物学，即对植物的研究，在人类知识的历史中占据了特殊的地位。 这是人类几千年 来超越模糊的认知而真正有所了解的领域之一。 我们今天不可能知道新石器时代的祖先们 对植物到底了解多少，但我们在至今仍存在的前工业化社会观察到：人类对植物及其特性的 详细了解应该是非常古老的。 这是理所当然的。 植物是其他生物甚至其他植物食物金字塔 的基础。 它们对人们的生活至关重要，不仅在食物上，而且在衣物、武器、工具、染料、药物、住所和许许多多其他的用途上。 至今仍生活在亚马逊河丛林中的部落确实能够辨识 几百种植物并知道每一种的许多特性。 对他们来说，植物学没有专门的名称，甚至可能根 本未被认为是一种专门知识。 不幸的是，工业化的程度越高，我们距直接与植物接触就越 远，我们的植物学知识的增加也就越微不足道。 然而每个人在不知不觉中拥有大量的植物 学知识，很少有人认不出玫瑰、苹果或兰花。 大约一万年前居住在中东的新时代的祖先们 发现某些草能被收获，它们的种子下一季耕种会收获更多时，人类就迈出了人和植物之间的 新关系第一大步。 谷子被发现后，农业的奇迹从此诞生：这就是可栽培的谷物。 从那时起， 人类越来越依赖少数可控制的作物生存，而不再是从众多的野生种类中这里获取一点，那里 获取一点。 这样在千万年中对于野生植物的经验和密切联系中积累起来的知识就开始消失 了。>33 Plankton Scattered through the seas of the world are billions of tons of small plants and animals called plankton.Most of these plants and animals are too small for the human eye to see.They drift about lazily with the currents, providing a basic food for many larger animals.Plankton has been described as the equivalent of the graes that grow on the dry land continents, and the comparison is an appropriate one.In potential food value, however, plankton far outweighs that of the land graes.One scientist has estimated that while graes of the world produce about 49 billion tons of valuable carbohydrates each year, the sea\'s plankton generates more than twice as much.Despite its enormous food potential, little effect was made until recently to farm plankton as we farm graes on land.Now marine scientists have at last begun to study this poibility, especially as the sea\'s resources loom even more important as a means of feeding an expanding world population.No one yet has seriously suggested that \"planktonburgers\" may soon become popular around the world.As a poible farmed supplementary food source, however, plankton is gaining considerable interest among marine scientists.One type of plankton that seems to have great harvest poibilities is a tiny shrimplike creature called krill.Growing to two or three inches long, krill provide the major food for the great blue whale, the largest animal ever inhabit the Earth.Realizing that this whale may grow to 100 feet and weigh 150 tons at maturity, it is not surprising that each one devours more than one ton of krill daily.浮游生物 数十亿吨的被称为\"浮游生物\"的小动物、植物散布在世界的海洋中。 这些小 的动、植物大多太小而难以被人眼看到。 它们随波逐流，为许多较大的动物提供了基本的 食物。 浮游生物曾被描述为生长在大陆陆地上的各种草类的海洋对应物。 这种比喻是恰当
的。 然而就潜在的食物价值而言，浮游生物远胜于草类。 一位科学家曾经估计，世界上的 草类每年生产大约 490 亿吨有用的碳水化合物，而海洋里的浮游生物每年生产的碳水化合物 多于此数的两倍。 尽管浮游生物具备巨大的食物潜能，但直到最近人们还很少象种植草类 那样付出努力养殖浮游生物。 现在，海洋科学家们至少已开始研究这种可能性。 全球人口 不断扩张，海洋资源作为食品的重要性日益突出。 现在还没有人认真说过\"浮游生物汉堡\" 会很快在世界上流行起来。 然而，作为一种可能养殖的补充性食物资源，浮游生物正引起 了海洋科学家们相当大的兴趣。 一种似乎具有很大收获可能性的微小的虾状浮游生物被称 为鳞虾。 鳞虾长至 2～3 英寸长时即成为地球上曾居住过的最大动物--蓝鲸的主要食物。 成 熟的蓝鲸可以达到 100 英尺长，150 吨重，所以每头鲸每天吞食 1 吨多的鳞虾一点也不让人 吃惊。 >34 Raising Oysters In the past oysters were raised in much the same way as dirt farmers raised tomatoesconversion of liquid water to water vapor.In this manner the salinity is increased, since the salts stay behind.If this is carried to the extreme, of course, white crystals of salt would be left behind.The opposite of evaporation is precipitation, such as rain, by which water is added to the ocean.Here the ocean is being diluted so that the salinity is decreased.This may occur in areas of high rainfall or in coastal regions where rivers flow into the ocean.Thus salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation or runoff.Normally, in tropical regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation.Similarly, in coastal regions where rivers dilute the sea, salinity is somewhat lower than in other oceanic areas.A third proce by which salinity may be altered is aociated with the formation and melting of sea ice.When sea water is frozen, the diolved materials are left behind.In this manner, sea water directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared.Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water.In the Weddell Sea Antarctica, the densest water in the oceans is formed as a result of this freezing proce, which increases the salinity of cold water.This heavy water sinks and is found in the deeper portions of the oceans of the world.海水盐度 如果我们分析海水的盐度，会发现地区间只有轻微的变化，然而有些小的变化是重要的。
导致海洋的盐度变化的基本过程有三个，其中之一是通过蒸发的方式即把液态水转化为水蒸 气来减少海洋中的水分。 这样由于盐留了下来，所以盐度增大。 当然，如果这种方式走向 极端，将会余下白色的盐晶体。 与蒸发相反的是降水，如降雨，由此水被加入海中，海水 被稀释，从而盐度降低。 这种情形会发生在大量降雨的地区，或江河入海岸处。 因此，盐 度通过蒸发减少水分而上升或通过降水或径流增加淡水成分而下降。 一般来说，在阳光很 强烈的热带地区，海水的盐度略高于世界上其它没有热带那样多的蒸发的地区。 同理，在 江河稀释海水的海岸地带，海水盐度略低于其它海区。 第三个可以变更盐度的过程与海洋 中冰的形成和融化有关。 海水冻结时，溶于其中的物质被留了下来。 这样，在新形成的海 水冰面的正下方的海水比在冰形成之前有更高的盐度。 当然，当冰融化的时候，会降低周 围水中的盐度。 在南极洲边缘的威德尔海中，结冰过程增加低温海水的盐度，从而形成了 浓度最大的海水。 这些大密度的海水下沉，可以在世界海洋的深水域发现。 >40 Cohesion-tension Theory Atmospheric preure can support a column of water up to 10 meters high.But plants can move water much higher; the sequoia tree can pump water to its very top more than 100 meters above the ground.Until the end of the nineteenth century, the movement of water in trees and other tall plants was a mystery.Some botanists hypothesized that the living cells of plants acted as pumps.But many experiments demonstrated that the stems of plants in which all the cells are killed can still move water to appreciable heights.Other explanations for the movement of water in plants have been based on root preure, a push on the water from the roots at the bottom of the plant.But root preure is not nearly great enough to push water to the tops of tall trees.Furthermore, the conifers, which are among the tallest trees, have unusually low root preures.If water is not pumped to the top of a tall tree, and if it is not pushed to the top of a tall tree, then we may ask: how does it get there? According to the currently accepted cohesion-tension theory, water is pulled there.The pull on a rising column of water in a plant results from the evaporation of water at the top of the plant.As water is lost from the surface of the leaves, a negative preure, or tension, is created.The evaporated water is replaced by water moving from inside the plant in unbroken columns that extend from the top of a plant to its roots.The same forces that create surface tension in any sample of water are responsible for the maintenance of these unbroken columns of water.When water is confined in tubes of very small bore, the forces of cohesion (the attraction between water molecules) are so great that the strength of a column of water compares with the strength of a steel wire of the same diameter.This cohesive strength permits columns of water to be pulled to great heights without being broken.内聚压力理论
大气压能够支持 10 米高的水柱，但植物可将水送得更高。 美洲红杉就能把水泵到地面 以上 100 多米高的树顶。 直到 19 世纪末，水在树木和其它高大植物中的输送还是一个谜。 一些植物学家假定植物中的活细胞充当了水泵的角色。 但许多实验表明细胞都已死亡的植 物茎干仍能将水输送到相当可观的高度。 对于植物中输送水的其它解释都基于根压--植物 底端的根对水的推动。 但根压完全不足以将水推到树顶。 况且，最高树木中的松柏只有很 低的根压。 如果水不是被泵到高树的树顶，也不是被推到树顶，那么我们会问：它是怎样 到达树顶的呢?根据目前为人们所接受的内聚压力的理论，水是被拉到上面去的。 一株植物 中作用于一个正在升高的水柱之上的拉力来自该植物顶部水的蒸发。 由于水从叶子表面丧 失，一个负压力，或张力就得以产生。 蒸发出去的水被植物里流动的水代替。 这些水形成 水柱从植物顶端一直延伸到根部。在任何水样中造成表面张力的力支持着这些不断的水柱。 当水被限制在内径很小的管道中时，内聚压力(水分子之间的相互吸引力)是如此之大以致一 支水柱的强度相当于一根直径相同的钢丝的强度。 这种内聚压力使得水柱被拉到非常高的 地方而不会断裂。 >41 American Black Bears American black bears appear in a variety of colors despite their name.In the eastern part of their range, most of these bears have shiny black fur, but in the west they grow brown, red, or even yellow coats.To the north, the black bear is actually gray or white in color.Even in the same litter, both brown and black furred bears may be born.Black bears are the smallest of all American bears, ranging in length from five to six feet, weighing from three hundred to five hundred pounds.Their eyes and ears are small and their eyesight and hearing are not as good as their sense of smell.Like all bears, the black bear is timid, clumsy, and rarely dangerous, but if attacked, most can climb trees and cover ground at great speeds.When angry or frightened, it is a formidable enemy.Black bears feed on leaves, herbs, roots, fruit, berries, insects, fish, and even larger animals.One of the most interesting characteristics of bears, including the black bear, is their winter sleep.Unlike squirrels, woodchucks, and many other woodland animals, bears do not actually hibernate.Although the bear does not eat during the winter months, sustaining itself from body fat, its temperature remains almost normal, and it breathes regularly four or five times per minute.Most black bears live alone, except during mating season.They prefer to live in caves, hollow logs, or dense thickets.A litter of one to four cubs is born in January or February after a gestation period of six to nine months, and they remain with their mother until they are fully grown or about one and a half years old.Black bears can live as long as thirty years in the wild, and even longer in game preserves set aside for them.美国黑熊
美国黑熊虽然被叫做黑熊但却有各种各样的颜色。 在它们生活区域的东部，大部分黑 熊长有富有光泽的黑毛，但在西部，他们则长着棕色、红色甚至是黄色的毛。 在北部，黑 熊其实长着灰色或白色的毛。 就是在一胎所生的小熊中，都可能混杂棕毛和黑毛。 黑熊是 所有美洲熊中最小的，5～6 英尺长，300～500 磅重。 它们的眼睛和耳朵都很小，他们的视 力和听觉不如嗅觉那样好。 像所有的熊一样，黑熊胆小，笨拙，很少具有危险性。 但如果 受到攻击，大部分黑熊会以很快的速度爬上树和奔跑。 当发怒或受惊吓时，黑熊会成为可 怕的对手。 黑熊以树叶、草、树根、水果、浆果、昆虫、鱼，甚至更大的动物为食。 熊类， 包括黑熊的最有趣的一个特点是他们的冬眠。 与松鼠、旱獭和其它别的林地动物不同，熊 并不真正地冬眠。 虽然熊在冬天的几个月中不吃东西，靠体内脂肪维持生命，但它们的体 温保持正常，并有规律地一分钟呼吸 4 或 5 次。除交配季节外，大多数黑熊独自生活。 他 们喜欢住在洞里、空心的大木头里或茂密的树丛里。 经过 6 到 9 个月的怀孕期后一胎 1～4 个小熊在 1 月或 2 月出生。 它们同母熊住在一起，直到它们完全长大，即 1 岁半左右。 黑 熊在野外可以活到长达 30 年，在专门的保护区中甚至能活得更长。 >42 Coal-fired Power Plants The invention of the incandescent light bulb by Thomas A.Edison in 1879 created a demand for a cheap, readily available fuel with which to generate large amounts of electric power.Coal seemed to fit the bill, and it fueled the earliest power stations (which were set up at the end of the nineteenth century by Edison himself).As more power plants were constructed throughout the country, the reliance on coal increased.Since the First World War, coal-fired power plants have accounted for about half of the electricity produced in the United States each year.In 1986 such plants had a combined generating capacity of 289, 000 megawatts and consumed 83 percent of the nearly 900 million tons of coal mined in the country that year.Given the uncertainty in the future growth of nuclear power and in the supply of oil and natural gas, coal-fired power plants could well provide up to 70 percent of the electric power in the United States by the end of the century.Yet, in spite of the fact that coal has long been a source of electricity and may remain one for many years (coal represents about 80 percent of United States foil-fuel reserves), it has actually never been the most desirable foil fuel for power plants.Coal contains le energy per unit of weight than natural gas or oil; it is difficult to transport, and it is aociated with a host of environmental iues, among them acid rain.Since the late 1960\'s problems of emiion control and waste disposal have sharply reduced the appeal of coal-fired power plants.The cost of ameliorating these environmental problems along with the rising cost of building a facility as large and complex as a coal-fired power plant, have also made such plants le attractive from a purely economic perspective.Changes in the technological base of coal-fired power plants could restore their attractivene, however.Whereas some of these changes are evolutionary and are intended mainly to increase the productivity of existing plants, completely new technologies for burning coal cleanly are also being developed.火力发电厂托马斯〃爱迪生 1879 年发明的白炽灯导致对便宜、易得、可生产大量电能 的燃料的需求。 煤似乎符合这个要求，并成为第一批电厂的燃料(正是爱迪生本人在 19 世 纪末建造了第一批电厂)。 全国到处兴建电厂时，对煤的依赖加深了。 自第一次世界大战 以来，美国每年约有一半的电力是以煤为燃料的电厂提供的。 1986 年这些电厂的总发电能 力达到 28，900 千瓦并且消耗了当年全国开采的九亿吨煤的 83%。 考虑到核能发展以及石 油、天然气供应中的不确定因素，到本世纪末，火力发电厂仍可能为美国提供多达 70%的 电力。 然而，尽管煤长期以来一直是电力的原料之一并且可能会继续如此(煤占美国化石燃 料储量的 80%)，它却不是电厂的理想燃料。 煤的单位能量含量低于石油和天然气，而且会 导致包括酸雨在内的一系列环境问题。 从 1960 年以来，排放控制和垃圾处理的问题极大地 削弱了燃煤电厂的魅力。 由于减轻这些环境问题需要大量资金，而且建造庞大复杂的燃煤 电厂的费用不断上涨，也使得这些电厂从经济角度上不具备吸引力。 改变火力发电厂的基 础技术却可能恢复它们的吸引力。 虽然某些技术改进是渐进的，其目的只是提高现有电厂 的生产率，但人们正在开发全新的清洁燃煤的技术。 >43 Statistics There were two widely divergent influences on the early development of statistical methods.Statistics had a mother who was dedicated to keeping orderly records of governmental units (state and statistics come from the same Latin root status) and a gentlemanly gambling father who relied on mathematics to increase his skill at playing the odds in games of chance.The influence of the mother on the offspring, statistics, is represented by counting, measuring, describing, tabulating, ordering, and the taking of censuses -- all of which led to modern descriptive statistics.From the influence of the father came modern inferential statistics, which is based squarely on theories of probability.Descriptive statistics involves tabulating, depicting and describing collections of data.These data may be quantitative such as measures of height, intelligence or grade level -- variables that are characterized by an underlying continuum -- or the data may represent qualitative variables, such as sex, college major or personality type.Large maes of data must generally undergo a proce of summarization or reduction before they are comprehensible.Descriptive statistics is a tool for describing or summarizing or reducing to comprehensible form the properties of an otherwise unwieldy ma of data.Inferential statistics is a formalized body of methods for solving another cla of problems that present great difficulties for the unaided human mind.This general cla of problems characteristically involve attempts to make predictions using a sample of observations.For example, a school superintendent wishes to determine the proportion of children in a large school system who come to school without breakfast, have been vaccinated for flu, or whatever.Having a little knowledge of statistics, the superintendent would know that it is unneceary and inefficient to question each child: the proportion for the entire district could be estimated fairly accurately from a sample of as few as 100 children.Thus, the purpose of inferential statistics is to predict or estimate characteristics of a population from a knowledge of the characteristics of only a sample of the population.统计学
统计方法的早期发展受到两种截然不同的影响。 统计学有一个\"母亲\"，她致力于井井 有条地记录政府机构的文件(国家和统计学这两个词源于同一个拉丁语词根，status)，还有一 个有绅士般的赌博\"父亲\"，他依靠数学来提高赌技，以便在几率的游戏中取胜。 \"母亲\"对 其子女统计学的影响表现在计数、测量、描述、制表、归类和人口普查。 所有这些导致了 现代描述统计学的诞生。 由于\"父亲\"的影响则产生了完全基于概率论原理的现代推理统计 学。 描述统计学涉及对所收集数据的制表、制图和描述。 这些数据可以是数量性的数据， 如高度、智商、或者是层级性的数据--具有连续性的变量--或数据也可以代表性质变量，如 性别、大学专业或性格类型等等。 数量庞大的数据通常必须经过概括或删减的程序才能为 人所理解。 描述统计学就是这样一个工具，它对极其庞杂的数据进行描述、概括或删减， 使其变成能为人理解的东西。 推理统计学是一套已定形了的方法体系，它解决的是光凭人 脑极难解决的另一类问题。 这类问题的显著特点是试图通过取样调查来作出预测。 例如， 有一位教育督察想知道在一个庞大的学校系统中，不吃早饭就上学的学生、已经做过防感冒 免疫的学生，或其它任何类型的学生占多大比例。 若具备一些统计学的知识，这位督察应 明白，询问每个孩子是没有必要而且没有效率的，只要用 100 个孩子为样本，他就可以相当 精确地得出这些孩子占整个学区的比例了。 因此，推理统计学的目的就是通过了解一个群 体中一些样本的特性，从而对整个群体的特性进行推测和估算。 >44 Obtaining Fresh Water from Icebergs The concept of obtaining fresh water from icebergs that are towed to populated areas and arid regions of the world was once treated as a joke more appropriate to cartoons than real life.But now it is being considered quite seriously by many nations, especially since scientists have warned that the human race will outgrow its fresh water supply faster than it runs out of food.Glaciers are a poible source of fresh water that has been overlooked until recently.Three-quarters of the Earth\'s fresh water supply is still tied up in glacial ice, a reservoir of untapped fresh water so immense that it could sustain all the rivers of the world for 1,000 years.Floating on the oceans every year are 7,659 trillion metric tons of ice encased in 10,000 icebergs that break away from the polar ice caps, more than ninety percent of them from Antarctica.Huge glaciers that stretch over the shallow continental shelf give birth to icebergs throughout the year.Icebergs are not like sea ice, which is formed when the sea itself freezes, rather, they are formed entirely on land, breaking off when glaciers spread over the sea.As they drift away from the polar region, icebergs sometimes move mysteriously in a direction opposite to the wind, pulled by subsurface currents.Because they melt more slowly than smaller pieces of ice, icebergs have been known to drift as far north as 35 degrees south of the equator in the Atlantic Ocean.To corral them and steer them to parts of the world where they are needed would not be too difficult.The difficulty arises in other technical matters, such as the prevention of rapid melting in warmer climates and the funneling of fresh water to shore in great volume.But even if the icebergs lost half of their volume in towing, the water they could provide would be far cheaper than that produced by desalinization, or removing salt from water.从冰山中获取淡水 把冰山拖到世界上人口稠密的地区和干旱地带，再从中获取淡水，这个想法曾一度被认
为是一个笑话，更适合于卡通画，而非现实生活。 然而现在，许多国家正相当认真地考虑 这件事情，特别是在科学家们发出警告之后。 科学家们认为人类将在耗尽粮食之前首先耗 尽淡水资源。冰川是一个直到最近以前一直被忽视的可能的淡水源。 全球四分之三的淡水 还锁在冰川的冰块中。 冰川就是一个蓄水池，其中未开发的淡水量是如此巨大，足够支持 全世界的江河 1000 年。 每年有 7，659 万亿公吨冰漂流在海洋中。 它们包含在 10，000 座从极地冰帽中断裂出来的冰山中。 这些冰山的 90%以上来自南极。 一年四季里，覆盖 在浅层大陆架上的巨大冰川生成了众多冰山。 冰山和海水的冰不同，后者是海水自身结冰 形成的，而冰山则完全是在陆地上形成的。 当冰川伸展到海水中时，冰山就断裂下来。 当 漂离极地地区时，冰山有时会在底层洋流的推动下颇为神秘地逆风移动。 由于冰山比小块 的冰融化要慢，因此有的冰山在大西洋中向北飘到了赤道以南 35°的地方。 把冰山蓄拦起 来并拖到世界上需要它们的地方将不会太困难。 有困难的是其它的技术事宜。 比如，如何 防止冰山在较暖的气候中迅速融化以及如何把大量的淡水收集到岸上去。 但是，即便在拖 的过程中冰山失去了一半体积，这样做也远比从海水中脱盐取得淡水便宜。 >45 The Source of Energy A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, at the Sun\'s very center.It is here that is to be found the source of the energy that the Sun constantly pours out into space as light and heat.This energy is liberated at the center of the Sun as billions upon billions of nuclei of hydrogen atoms collide with each other and fuse together to form nuclei of helium, and in doing so, release some of the energy that is stored in the nuclei of atoms.The output of light and heat of the Sun requires that some 600 million tons of hydrogen be converted into helium in the Sun every second.This the Sun has been doing for several thousands of millions of years.The nuclear energy is released at the Sun\'s center as high-energy gamma radiation, a form of electromagnetic radiation like light and radio waves, only of very much shorter wavelength.This gamma radiation is absorbed by atoms inside the Sun to be reemitted at slightly longer wavelengths.This radiation, in its turn is absorbed and reemitted.As the energy filters through the layers of the solar interior, it paes through the X-ray part of the spectrum eventually becoming light.At this stage, it has reached what we call the solar surface, and can escape into space without being absorbed further by solar atoms.A very small fraction of the Sun\'s light and heat is emitted in such directions that after paing unhindered through interplanetary space, it hits the Earth.能量的来源
概说生命的物理和化学特性必须始于太阳--确切地说，是太阳的核心，而非地球。 能 量来自太阳的核心。 在这里，太阳不停地以光和热的形式向空间倾泻出能量。 数十亿计的 氢原子核在太阳的核心碰撞并且聚变生成氦。 在此过程中一部分原本储存于原子核中的能 量被释放出来。 太阳所产生的光和热需要每秒将六亿吨氢转化为氦。 这样的转化在太阳中
已经持续几十亿年了。 核能在太阳的核心被释放为高能的伽马射线。 这是一种电磁射线， 就象光波和无线电波一样，只是波长要短得多。 这种伽玛射线被太阳内的原子所吸收，然 后重新释放为波长稍长一些的光波。 这新的射线再次被吸收，而后释放。 在能量由太阳内 部一层层渗透出来的过程中，它经过了光谱中 X 射线部分，最后变成了光。 在此阶段，能 量到达我们所称的太阳表层，并且离散到空间而不再被太阳原子所吸收。 只有很小一部分 太阳的光和热由此方向释放出来，并且未被阻挡，穿越星空，来到地球。 >46 Vision Human vision like that of other primates has evolved in an arboreal environment.In the dense complex world of a tropical forest, it is more important to see well than to develop an acute sense of smell.In the course of evolution members of the primate line have acquired large eyes while the snout has shrunk to give the eye an unimpeded view.Of mammals only humans and some primates enjoy color vision.The red flag is black to the bull.Horses live in a monochrome world.Light visible to human eyes however occupies only a very narrow band in the whole electromagnetic spectrum.Ultraviolet rays are invisible to humans though ants and honeybees are sensitive to them.Humans have no direct perception of infrared rays unlike the rattlesnake which has receptors tuned into wavelengths longer than 0.7 micron.The world would look eerily different if human eyes were sensitive to infrared radiation.Then instead of the darkne of night, we would be able to move easily in a strange shadowle world where objects glowed with varying degrees of intensity.But human eyes excel in other ways.They are in fact remarkably discerning in color gradation.The color sensitivity of normal human vision is rarely surpaed even by sophisticated technical devices.视觉
人类的视觉，和其它灵长目动物的一样，是在丛林环境中进化出来的。 在稠密、复杂 的热带丛林里，好的视觉比灵敏的嗅觉更加重要。 在进化过程中，灵长目动物的眼睛变大， 同时鼻子变小以使视野不受阻碍。 在哺乳类动物中，只有人和一些灵长目动物能够分辨颜 色。 红旗在公牛看来是黑色的，马则生活在一个单色的世界里。 然而，人眼可见的光在整 个光谱中只占一个非常狭窄的频段。人是看不到紫外线的，尽管蚂蚁和蜜蜂可以感觉到。与 响尾蛇不同，人也不能直接感受到红外线。 响尾蛇的感觉器可以感受波长超过 0.7 微米的 光线。 如果人能感受到红外线的话，这世界看上去将十分不同，而且恐怖。 到那时，将与 夜的黑暗相反，我们能轻易地在一个奇异的没有阴影的世界里走动。 任何物体都强弱不等 地闪着光。 然而，人眼在其它方面有优越之处。 事实上，人眼对颜色梯度具有非凡的分辨 能力。 普通人类的视觉感受色彩的灵敏程度，甚至连精密的技术装备都很难超越。 >47 Folk Cultures A folk culture is a small isolated, cohesive, conservative, nearly self-sufficient group that is homogeneous in custom and race with a strong family or clan structure and highly developed rituals.Order is maintained through sanctions
