10. The knee is the joints where the thigh bone meets the large bone of the lower leg.
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.
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.
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.
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.
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.
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.
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.
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.
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。

46. According to anthropologists, the earliest ancestors of humans that stood upright resembled chimpanzees facially, with sloping foreheads and protruding brows.
根据人类学家的说法，直立行走的人的鼻祖面部轮廓与黑猩猩相似，额头后倾，眉毛突出。
47. Not until 1866 was the fully successful transatlantic cable finally laid.
直到1866年第一条横跨大西洋的电缆才完全成功的架通。
48. In his writing, John Crowe Ransom describes what he considers the spiritual barrenness of society brought about by science and technology.
John Crowe Ransom在他的著作中描述了他认为是由科学技术给社会带来的精神贫困。
49. Children with parents whose guidance is firm, consistent, and rational are inclined to possess high levels of self-confidence.
父母的教导如果坚定，始终如一和理性，孩子就有可能充满自信。
50. The ancient Hopewell people of North America probably cultivated corn and other crops, but hunting and gathering were still of critical importance in their economy.
北美远古的Hopewell人很可能种植了玉米和其他农作物，但打猎和采集对他们的经济贸易仍是至关重要的。
51. Using many symbols makes it possible to put a large amount of information on a single map.
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.
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.
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.
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。

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.
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.
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.
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.
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.
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. Snow aids farmers by keeping heart in the lower ground levels, thereby saving the seeds from freezing.
雪对农民是一种帮助，因为它保持地层土壤的温度，使种子不致冻死。
70. Even though the precise qualities of hero in literary words may vary over time, the basic exemplary function of the hero seems to remain constant.
历代文学作品中的英雄本色虽各有千秋，但其昭世功力却是恒古不变的。
71. People in prehistoric times created paints by grinding materials such as plants and clay into power and then adding water.
史前的人们制造颜料是将植物和泥土等原料磨成粉末，然后加水。
72. Often very annoying weeds, goldenrods crowd out less hardy plants and act as hosts to many insect pests.
黄菊花通常令人生厌，它挤走不那么顽强的植物，并找来很多害虫。