17.mathematician n. expert in mathematics数学家

[记忆法]mathematics (n. 数学)常缩写为maths; arithmetic 是"算术"。

18.equipment n. things needed for a particular purpose设备，装置，器材 [同] apparatus, furnishings, outfit, supplies, tools

［例句］We have purchased a lot of office equipment. 我们购置了很多办公设备。
[记忆法] 派生法：equip vt. 装备……

19.equip vt. Supply sb./sth. With what is needed, for a particular purpose装备，配备[同]furnish, arm, provide, supply

［例句］The soldiers were well equipped with weapons and ammunition. 士兵们装备好了武器和弹药。

[考点]注意这个词的过去时，过去分词和现在分词都要双写"p"，即equipped, equipping。

[考点]习惯用语：
be equipped with 装配备
be equipped for 为……作好准备

[典型考题]Your education will you for your future life. [D]
A. equal B. ready C. help D. equip

[试题解析]equal等同, 搭配为equal to；ready准备好的，搭配为be ready to do sth.; help帮助，后面不跟for sth.。

20.kilo=kilogram n. kilogram公斤，千克

［例句］Distance between the two cities is more than 100 kilometers. 两个城市之间距离超过一百公里。

[记忆法]kilo表示"千"，所以有kilometer 千米，kilowatt千瓦等。

21.recent adj. that existed, happened, began, tec. Not long ago 近来的，新近的 [同]fresh, new late

［例句］Could you tell about his recent health conditions. 你可以赞许告诉我他最近的身体状况吗？

[考点]注意recently一般用于现在完成时。
[典型考题]In years, there have been many changes in this town. [D]
[A] new [B] modern [C] contemporary [D] recent

[试题解析]题意：这个城镇最近几年发生了很多变化。new指存在不久的新兴事物；recent指发生或出现不久的事物；modern所包含的时间比new长，意思是"现代的"，contemporary当代的。

22.recall vt. Bring sth./sb. Back into the mind; recollect (1)记得，回忆起

[同]recollect, remember (2) 召回，撤销，收回 [同]take back

［例句］Can you recall exactly what you saw last night? 你能不能准确回忆你昨晚上所看到的？
The ambassador was recalled to his own country a month ago. 一个月前大使被召回国。

[考点]recall主要用于如下句型：recall sb.(sth.) 记起； recall doing (sth.) 记起做过某事；recall that 回忆起…； recall +疑问词 回忆起………
I can't recall her face. 我回忆不起她的长相了。
I can't recall having met him before. 我记不得先前曾见过他。

[典型考题]I fail to ever meeting her. [A]
A. recall B. pretend C. plan D. hope

[试题解析]题意：我想不起见过她。recall后面有宾语时，要接动名词形式； pretend 假装； plan计划，打算；hope希望，都没有这种用法。

23．put…to (good) use: use (in a profitable way) (好好)利用

[例句]　In this present job ,he will be able to put to use everything he studied at the university. 他能在他现在的工作中利用他在大学时学到的所有东西。
Being a poor student, I know how to put my money to better use. 作为一个穷学生，我知道如何更好的花钱。

24.differ vi. Not be the same as sb./sth.; be unlike不同，分歧 [同]disagree, disaccord, dissent, diverge, contradict, dispute

［例句］The twin brothers differ from each other in their interest. 双胞胎兄弟在兴趣不一样。
[记忆法]派生法：difference n. 不同；different adj. 不同的

[考点]differ常用于如下句型：
differ from sb. (sth.), 不一样，与……不同
differ with sb. (sth.), 不同意
differ on sth. 持异议 (某一论题)
differ in sth. 持异议 (某一方面)
She differs from her sister in the color of eyes. 她跟她姐姐不同之处（方面）在于眼睛的颜色。
The two governments differ with each other on the political question.两国政府在这个政治问题上有分歧。

[典型考题]They still each other over the question of pay. [B]
A. differ B. differ with C. differ in D. differ for

[试题解析]differ不能作及物动词；differ in见考点提要；没有differ for 这种搭配。

25.compared to /with: in comparison with 与……相比

[例句]　Compared to many other women in old China, she was indeed very fortunate. 和旧中国其他众多妇女相比，她真是非常幸运的。
They considered his speech mild compared with his former ones. 和他以前的演讲相比，他们认为他这次的演讲长是比较温和的。

26． as long as : if , on the condition that只要，如果

[例句] You can watch TV as long as you finish your assignment. 只要你做完作业就可以看电视。
You can go out as long as you promise to be back before 11 o'clock. 你可以出去，只要你答应11点以前回来。

27.mentally adv. In the mind 智力上，脑力上 [同]cognitively, intellectually, rationally

[记忆法] 派生法： mental adj. 智力的，精神的，思想的，疯疯癫癫的mentality n. 智力，精神，思想；mentalism n. 精神论，心灵主义 mentalist n. 精神论者，心灵主义者。

28.physical adj. (1)of the body身体的，肉体的 [同]bodily, corporeal
(2)of or concerning material things物质的，有形的 [同]material, substantial
(3)of or according to the laws of nature物理的，自然科学的。

[例句]　Constant physical exercises lead to long life. 坚持体育锻炼可以长寿。
Issac Newton observed the physical world and than drew conclusions. 牛顿观察物质世界并作出结论。
The Physical Chemistry course has attracted a lot of students. 物理化学课程吸引很多学生。

[记忆法] 派生法：physics n. 物理学 physique n. 体格 physicist n 物理学家 physician n. 内科医生

[典型考题]There must be a explanation for these strange happenings, which have made up restless all these days. [A]
A. physical B. mental C. practical D. natural

[试题解析]mental精神上的；practical实际的；natural自然的

29.potential n. in existence and capable of being developed or used 潜力，潜能
adj. possible同] likely, probable

[例句]　This product holds a great market potential. 这种产品拥有很大的市场潜力。
The book is a potential best seller. 该书有可能成为一部畅销书。

[记忆法] 派生法：potent adj. （药物等）强力的，有效的，烈性的；（辩论等）使人心服的，有力的；（政治上）强有力的；potency n. 能力

30.limit n. point or line beyond which sth. Not extend; boundary (1)局限，限度 [同]restriction (2)( pl.)范围 [同]bound
vt. 限定，限制 [同]restrict, confine

[例句]　He tried my patience to its limits. 他把我逼得忍无可忍。
No fishing is allowed within a twenty-mile limit. 二十英里范围内不准捕捞鱼类。
We must limit our expenditure. 我们必须限制我们的开支。

[记忆法] 派生法：limitation　n. 限度，限制，局限 limited adj. 被限制的，有限的 unlimited adj. 无限的，无约束的

[辨析]：limit 和 limitation:
limit 指有形或无形的东西，如智力，时间，权力，议论，都市，欲望等的界限；而limitation则着重强调能力的局限性或缺陷。
We must set a limit to the expense of the trip. 我们必须对旅行费用定一个限度。
His bad eyesight is a limitation. 他的近视就是一个缺陷。

[典型考题]We must ourselves to an hour. [A]
A. limit B. strict C. lime D. limb

[试题解析]strict为形容词，严格的，lime石灰，limb四肢，都是名词。