1. Typical of the grassland dwellers of the continent is the American antelope, or pronghorn.
  1.美洲羚羊,或称叉角羚,是该大陆典型的草原动物。
  2. Of the millions who saw Haley's comet in 1986, how many people will live long enough to see it return in the twenty-first century.
  2. 1986 年看见哈雷慧星的千百万人当中,有多少人能够长寿到足以目睹它在二十一世纪的回归呢?
  3. Anthropologists have discovered that fear, happiness, sadness, and surprise are universally reflected in facial expressions.
  3.人类学家们已经发现,恐惧,快乐,悲伤和惊奇都会行之于色,这在全人类是共通的。
  4. Because of its irritating effect on humans, the use of phenol as a general antiseptic has been largely discontinued.
  4.由于苯酚对人体带有刺激性作用,它基本上已不再被当作常用的防腐剂了。
  5. In group to remain in existence, a profit-making organization must, in the long run, produce something consumers consider useful or desirable.
  5.任何盈利组织若要生存,最终都必须生产出消费者可用或需要的产品。
  6. The greater the population there is in a locality, the greater the need there is for water, transportation, and disposal of refuse.
  6.一个地方的人口越多,其对水,交通和垃圾处理的需求就会越大。
  7. It is more difficult to write simply, directly, and effectively than to employ flowery but vague expressions that only obscure one's meaning.
  7.简明,直接,有力的写作难于花哨,含混而意义模糊的表达。
  8. With modern offices becoming more mechanized, designers are attempting to personalize them with warmer, less severe interiors.
  8.随着现代办公室的日益自动化,设计师们正试图利用较为温暖而不太严肃的内部装饰来使其具有亲切感。
  9. The difference between libel and slander is that libel is printed while slander is spoken.
  9.诽谤和流言的区别在于前者是书面的,而后者是口头的。
  10. The knee is the joints where the thigh bone meets the large bone of the lower leg.
  10.膝盖是大腿骨和小腿胫的连接处。
  11. Acids are chemical compounds that, in water solution, have a sharp taste, a corrosive action on metals, and the ability to turn certain blue vegetable dyes red.
  11.酸是一种化合物,它在溶于水时具有强烈的气味和对金属的腐蚀性,并且能够使某些蓝色植物染料变红。
  12. Billie Holiday's reputation as a great jazz-blues singer rests on her ability to give emotional depth to her songs.
  12. Billie Holiday's 作为一个爵士布鲁斯乐杰出歌手的名声建立在能够赋予歌曲感情深度的能力。
  13. Essentially, a theory is an abstract, symbolic representation of what is conceived to be reality.
  13.理论在本质上是对认识了的现实的一种抽象和符号化的表达。
  14. Long before children are able to speak or understand a language, they communicate through facial expressions and by making noises.
  14.儿童在能说或能听懂语言之前,很久就会通过面部表情和靠发出噪声来与人交流了。
  15. Thanks to modern irrigation, crops now grow abundantly in areas where once nothing but cacti and sagebrush could live.
  15.受当代灌溉(技术设施)之赐,农作物在原来只有仙人掌和荞属科植物才能生存的地方旺盛的生长。
  16. The development of mechanical timepieces spurred the search for more accurate sundials with which to regulate them.
  16.机械计时器的发展促使人们寻求更精确的日晷,以便校准机械计时器。
  17. Anthropology is a science in that anthropologists use a rigorous set of methods and techniques to document observations that can be checked by others
  17.人类学是一门科学,因为人类学家采用一整套强有力的方法和技术来记录观测结果,而这样记录下来的观测结果 是供他人核查的。

  18. Fungi are important in the process of decay, which returns ingredients to the soil, enhances soil fertility, and decomposes animal debris.
  18.真菌在腐化过程中十分重要,而腐化过程将化学物质回馈于土壤,提高其肥力,并分解动物粪便。
  19. When it is struck, a tuning fork produces an almost pure tone, retaining its pitch over a long period of time.
  19.音叉被敲击时,产生几乎纯质的音调,其音量经久不衰。
  20. Although pecans are most plentiful in the southeastern part of the United States, they are found as far north as Ohio and Illinois.
  20.虽然美洲山河桃树最集中于美国的东南部但是在北至俄亥俄州及伊利诺州也能看见它们。

  21. Eliminating problems by transferring the blame to others is often called scape-goating.
  21.用怪罪别人的办法来解决问题通常被称为寻找替罪羊。
  22. The chief foods eaten in any country depend largely on what grows best in its climate and soil.
  22.一个国家的主要食物是什么,大体取决于什么作物在其天气和土壤条件下生长得最好。
  23. Over a very large number of trials, the probability of an event's occurring is equal to the probability that it will not occur.
  23.在大量的实验中,某一事件发生的几率等于它不发生的几率。
  24. Most substance contract when they freeze so that the density of a substance's solid is higher than the density of its liquid.
  24.大多数物质遇冷收缩,所以他们的密度在固态时高于液态。
  25. The mechanism by which brain cells store memories is not clearly understood.
  25.大脑细胞储存记忆的机理并不为人明白。
  26. By the middle of the twentieth century, painters and sculptors in the United States had begun to exert a great worldwide influence over art.
  26.到了二十一世纪中叶,美国画家和雕塑家开始在世界范围内对艺术产生重大影响。
  27. In the eastern part of New Jersey lies the city of Elizabeth, a major shipping and manufacturing center.
  27.伊丽莎白市,一个重要的航运和制造业中心,坐落于新泽西州的东部。
  28. Elizabeth Blackwell, the first woman medical doctor in the United States, founded the New York Infirmary, an institution that has always had a completely female medical staff.
  28. Elizabeth Blackwell,美国第一个女医生,创建了员工一直为女性纽约诊所。
  29. Alexander Graham Bell once told his family that he would rather be remembered as a teacher of the deaf than as the inventor of the telephone.
  29. Alexander Graham Bell 曾告诉家人,他更愿意让后人记住他是聋子的老师,而非电话的发明者。
  30. Because its leaves remain green long after being picked, rosemary became associated with the idea of remembrance.
  31. Although apparently rigid, bones exhibit a degree of elasticity that enables the skeleton to withstand considerable impact.
  31.骨头看起来是脆硬的,但它也有一定的弹性,使得骨骼能够承受相当的打击。
  32. That xenon could not form chemical compounds was once believed by scientists.
  32.科学家曾相信:氙气是不能形成化合物的。
  33. Research into the dynamics of storms is directed toward improving the ability to predict these events and thus to minimize damage and avoid loss of life.
  33.对风暴动力学的研究是为了提高风暴预测从而减少损失,避免人员伤亡。
  34. The elimination of inflation would ensure that the amount of money used in repaying a loan would have the same value as the amount of money borrowed.
  34.消除通货膨胀应确保还贷的钱应与所贷款的价值相同。
  35. Futurism, an early twentieth-century movement in art, rejected all traditions and attempted to glorify contemporary life by emphasizing the machine and motion.
  35.未来主义,二十世纪早期的一个艺术思潮。拒绝一切传统,试图通过强调机械和动态来美化生活。
  36. One of the wildest and most inaccessible parts of the United States is the Everglades where wildlife is abundant and
largely protected.
  36. Everglades 是美国境内最为荒凉和人迹罕至的地区之一,此处有大量的野生动植物而且大多受(法律)保护。
  37. Lucretia Mott's influence was so significant that she has been credited by some authorities as the originator of feminism in the United States.
  37. Lucretia Mott's 的影响巨大,所以一些权威部门认定她为美国女权运动的创始人。
  38. The activities of the international marketing researcher are frequently much broader than those of the domestic marketer.
  38.国际市场研究者的活动范围常常较国内市场研究者广阔。
  39. The continental divide refers to an imaginary line in the North American Rockies that divides the waters flowing into the Atlantic Ocean from those flowing into the Pacific.
  39.大陆分水岭是指北美洛矶山脉上的一道想象线,该线把大西洋流域和太平洋流域区分开来。
  40. Studies of the gravity field of the Earth indicate that its crust and mantle yield when unusual weight is placed on them.
  51. Using many symbols makes it possible to put a large amount of information on a single map.
  51.使用多种多样的符号可以在一张地图里放进大量的信息。
  52. Anarchism is a term describing a cluster of doctrines and attitudes whose principal uniting feature is the belief that government is both harmful and unnecessary.
  52.无政府主义这个词描述的是一堆理论和态度,它们的主要共同点在于相信政府是有害的,没有必要的。
  53. Probably no man had more effect on the daily lives of most people in the Untied States than did Henry Ford a pioneer in automobile production.
  53.恐怕没有谁对大多数美国人的日常生活影响能超过汽车生产的先驱亨利.福特。
  54. The use of well-chosen nonsense words makes possible the testing of many basic hypotheses in the field of language learning.
  54.使用精心挑选的无意义词汇,可以检验语言学科里许多基本的假定。
  55. The history of painting is a fascinating chain of events that probably began with the very first pictures ever made.
  55.优化历史是由一连串的迷人事件组成,其源头大概可以上溯到最早的图画。
  56. Perfectly matched pearls, strung into a necklace, bring a far higher price than the same pearls told individually.
  56.相互般配的珍珠,串成一条项链,就能卖到比单独售出好得多的价钱。
  57. During the eighteenth century, Little Turtle was chief of the Miami tribe whose territory became what is now Indiana and Ohio.
  57.十八世纪时,"小乌龟"是迈阿密部落的酋长,该部落的地盘就是今天的印第安那州和俄亥俄州。
  58. Among almost seven hundred species of bamboo, some are fully grown at less than a foot high, while others can grow three feet in twenty-four hours.
  58.在竹子的近七百个品种中,有的全长成还不到一英尺,有的却能在二十四小时内长出三英尺。
  59. Before staring on a sea voyage, prudent navigators learn the sea charts, study the sailing directions, and memorize lighthouse locations to prepare themselves for any conditions they might encounter.
  59.谨慎的航海员在出航前,会研究航向,记录的灯塔的位置,以便对各种可能出现的情况做到有备无患。
  60. Of all the economically important plants, palms have been the least studied.
  60.在所有的经济作物中,棕榈树得到的研究最少。
  61.购买者和销售者都应该留意技术的新发展,原因很简单,因为技术能够并且已经影响着营销活动。
  62. The application of electronic controls made possible by the microprocessor and computer storage have multiplied the uses of the modern typewriter.
  62.电脑储存和由于电子微处理机得以实现的电控运用成倍的增加了现代打字机的功能。
  63. The human skeleton consists of more than two hundred bones ### together by tough and relatively inelastic connective tissues called ligaments.

  63.人类骨骼有二百多块骨头组成,住些骨头石油坚韧而相对缺乏弹性的,被称为韧带的结蒂组连在一起。
  64. The pigmentation of a pearl is influenced by the type of oyster in which it develops and by the depth, temperature, and the salt content of the water in which the oyster lives.
  64.珍珠的色泽受到作为其母体牡蛎种类及牡蛎生活水域的深度,温度和含盐度的制约。
  65. Although mockingbirds superbly mimic the songs and calls of many birds, they can nonetheless be quickly identified as mockingbirds by certain aural clues.
  65.尽管模仿鸟学很多种鸟的鸣叫声惟妙惟肖,但人类还是能够依其声音上的线索很快识别它们。
  66. Not only can walking fish live out of water, but they can also travel short distances over land.
  66.鲇鱼不仅可以离开水存活,还可以在岸上短距离移动。
  67. Scientists do not know why dinosaurs became extinct, but some theories postulate that changers in geography, climate, and sea levels were responsible.
  67.科学家不知道恐龙为何绝种了,但是一些理论推断是地理,气候和海平面的变化造成的。
  68. The science of horticulture, in which the primary concerns are maximum yield and superior quality, utilizes information derived from other sciences.
  68.主要目的在于丰富和优质的农艺学利用了其他科学的知识。 69
 

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