50个句子就可以记完7000单词（注释版）

1. Typical of the grassland dwellers of the continent is the American antelope, or pronghorn。 美洲羚羊，或称叉角羚，是该大陆典型的草原动物。

Typical: a. [(+of)] (1). 典型的,有代表性的: This painting is typical of his early work. (这幅画是他早期的代表作)；(2). 特有的, 独特的; 表现特征的: It was typical of him to be so merciless. (只有他才会这么冷酷无情)。 Dweller: n. 居民;

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。

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。

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。

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。

Irritate: vt. (1). 使恼怒; 使烦躁: His letter irritated me a little. (他的信使我有点恼火) ；(2). 使过敏; 使难受; 使发炎; 使疼痛: These tight shoes irritate my toes. (我的鞋太紧,夹痛我的脚趾) ；(3). 刺激, 使兴奋

Septic: ['septik] a. (1). 能使腐败的;因腐败而起的；(2). 【医】败血症的。

5. In group to remain in existence, a profit-making organization must, in the long run, produce something consumers consider useful or desirable。

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。

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。

Disposal: n. [U] (1). 处理,处置: The sanitation department is in charge of garbage disposal. (环境卫生部门负责处理垃圾) ；(2). 配置; 布置; 排列: They spent quite some time on the disposal of furniture in their new house. (他们在新居的家具布置上花了相当多的时间) ；(3). 出售; 转让; (4). 控制;(自由)处置权: A huge supply of knowledge is at your disposal at the library. (图书馆里有大量知识任你学习使用)。 Refuse：n. 废物,废料,垃圾；v. 拒绝, 谢绝, 辞退

7. It is more difficult to write simply, directly, and effectively than to employ flowery but vague expressions that only obscure one’s meaning。

简明，直接，有力的写作难于花哨，含混而意义模糊的表达。

Vague: a. (1). (形状等)模糊不清的,朦胧的: Everything looked vague in the heavy fog. (在浓雾中,一切东西看上去都很模糊) ；(2). (想法等)不明确的;暧昧的,含糊的: I'm quite vague about what happened. (我对发生的事很不了解) ；You should not make vague promises. (你不该作含

糊不清的承诺) ；(3). 无表情的: He was a small man with vague eyes. (他身材矮小,眼睛没有表情) ；(4). (在否定句中用最高级)少许的[B]: I haven't the vaguest idea what she means. (我一点也不知道她是什么意思)。

Obscure: a. (1). 暗的,黑暗的;朦胧的: The room is too obscure for reading. (房间太暗,不能看书) ；(2). 模糊的;含糊不清的;晦涩的,难解的[(+to)]: The meaning of the passage is obscure. (这段文字意义晦涩) ；(3). 隐匿的;偏僻的: He came from an obscure mountain village. (他来自一个偏僻的山村) ；(4). 无名的;微贱的: It is written by an obscure young poet. (这是一位不知名的年轻诗人写的)。

8. With modern offices becoming more mechanized, designers are attempting to personalize them with warmer, less severe interiors。 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。 诽谤和流言的区别在于前者是书面的，而后者是口头的。

Libel: n. (1). 律】(利用文字、图画等的)诽谤(罪)[U]: commit libel (犯诽谤罪); (2). 诽谤的文字(或图画等)[C][(+on/against)]: a libel on my character (对我人格的污蔑); (3). (海事法、教会法等中的)原告诉状[C]。 vt. (1). 【律】用文字(或图画等)诽谤; (2). 对...造谣中伤: He claims he has been libeled in the press. (他声称报纸对他造谣中伤)；(3). (教会法等中) 对...提出控告。 Slander: n. [C][U]: (1). 诽谤,诋毁,造谣中伤: The article is a slander on us. (这篇文章是对我们的诽谤) ；(2). (口头)诽谤罪.

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骨的连接处。

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。

rest on: 依靠: The bridge rests on stone arches. (这座桥靠石拱支撑)。

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。

symbolic: 形容词 a. (1). 象征的, 象征性的; 作为象征的 [(+of)]: The snake is symbolic of evil. (蛇象征邪恶)；(2). 象征主义的； (3). 符号的;使用符号的。 conceive：vt. [W] (1). 构想出,想象,设想[+wh-]: Who first conceived the idea of building nuclear power plants? (是谁第一个想到建核能电厂的?)；(2). 怀 (胎); 抱有 (想法, 感情等) ：She conceives love for the children. （她爱这些孩子。）；She conceived a dislike for her neighbor's son.

（她对邻居的那个儿子感到厌恶。）；(3). 表达 [H] ； (4). 认为[(+as)][O1]：He conceived it his duty to help his deceased friend's family. （他认为帮助亡友的家属是他的责任。）；vi. [W] (1). 构想,设想[(+of)]：I simply could not conceive of a family of four living in such a small room? （我简直不能想像一家四口住在这么小的屋里?）；(2). 怀孕。

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。

noise：(1). 声响; 喧闹声[C][U]：What's up? There's such a loud noise in the corridor. （出什么事啦?走廊里喧闹声那么大。）； (2) 噪音,干扰[U]；(3). 议论[C][U]。vt. 纷纷传说;谣传[H][(+about/abroad/around)]：It was noised about that the foreign minister intended to resign. （外界传说外交部长打算辞职。）

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。 spur：n. [C] (1). 踢马刺,靴刺：He dug in his spurs. （他用马刺策马前进。）；(2). 刺激,激励;鼓舞[(+to)]：The thought of the prize was the spur for the team. （夺取锦标的思想是该队的动力。）；(3). 靴刺状物； (4). (鸡,鸟,虫等的)距；(5). (铁路的) 支线； (6). (山的)支脉,山鼻子：A spur of rock stuck out from the mountain. （山背上突起一个石脊。）；(7). 骨刺。vt. (1). 用靴刺踢[(+on)]：The rider spurred his horse on. （骑马人策马前行。）(2). 鞭策,鼓励[(+on)]：He spurred his players to fight harder. （他激励他的球员更加努力地战斗。 ）(3). 给...装踢马刺。vi. (1). 策马飞奔;急速前进：He spurred forward to his destination. （他驱马疾驰,直奔目的地。）(2). 给予刺激。

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。

Rigorous: adj. (1).严密的; 缜密的; The planes have to undergo rigorous safety checks. (飞机必须经过严密的安全检查)。(2). 严格的, 严厉的; Vigorous youth is subjected to rigorous discipline. (活泼的年轻人须受到严格的纪律约束)。

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。

Ingredient: n. (混合物的)组成部分; 配料; Imagination and hard work are the ingredients of success. (想像力和勤劳是成功的要素)。

Decompose: (1). vt. & vi. (使某物)变坏, 腐烂; Most animals decompose very quickly after death. (大多数动物死后很快腐烂)。(2). vt. <化>分解(某物质、光线等); A liquid is decomposed when an electric current passes through it. (当电流通过时, 液体就分解)。

Debris: n. 散落的碎片, 残骸; After the bombing there was a lot of debris everywhere. (轰炸过后到处是一片残骸)。

19. When it is struck, a tuning fork produces an almost pure tone, retaining its pitch over a long period of time。

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。

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。 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。

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。

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。

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。 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。

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。

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。 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。

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。

采摘下的迷迭香树叶常绿不衰，因此人们把迷迭香树与怀念联系在一起。

31. Although apparently rigid, bones exhibit a degree of elasticity that enables the skeleton to withstand considerable impact。

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。 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.

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。 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。

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。

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。

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。

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

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