no one knows how to accelerate the rate of growth.
a. 绝对的，无条件的；完全的 her new dress is an absolute dream.
a. 模糊的，不明确的 his vague ideas crystallized into a definite plan.
n. 徒劳，白费 she is vain of her voice. 她自以为她的声音了不起。
all our work was in vain. 我们所有的工作都白费了。
a.灭绝的，熄灭的 some of the species of birds are extinct. 有几种鸟类已经绝种了。
a. 不平常的，特别的，非凡的 she wears the most extraordinary shoes.
a. 极度的，极端的 n. 极端，过分 the capital is in the extreme south of the country.
n. **人，**商；动因，原因 i booked my holiday through my local tr**el agent.
rain and sun are the agents which help plants to grow.
n. 含酒精的饮料，酒精 he is addicted to alcohol.
n./vi. 呼吁，恳求 her eyes held a look of silent appeal.
the government is appealing to everyone to s**e water.
vt. 重视，赏识，欣赏 we appreciate your helping us.
v. 赞成，同意，批准 you can join the class if you parents approve. my parents don't approve of me smoking cigarettes.
vt. 刺激，激励 light stimulates plant growth.
praise always stimulates him to make greater efforts. 表扬能激励他更加努力。
vt. 取得，获得；学到 how did he acquire his wealth?
she acquired a knowledge of the english by careful study.
vt .完成，到达；实行 we should not try to accomplish two tasks at onceto accomplish a purpose 达到目的。
n./vt. 拷打，折磨 he tortured his prisoners.
v. 保护，保存，保持，维持 salt and spices help to preserve meat.
35. abuse v. n.滥用，虐待；谩骂 she attacked him with a torrent of abuse.
he was charged of abusing a privilege. 他因滥用特权而被起诉。
36. academic a. 学术的；高等院校的；研究院的 she already has good academic qualifications.
37. academy n. （高等）专科院校；学会 he is a student in an academy of music.
38. barrier n. 障碍；棚栏 the lorry sh**ed the barrier, scraping its side.
39. career n. 生涯，职业 this career offers a challenge.
40. oblige v. 迫使，责成；使感激 could you oblige me by closing the door.
41. obscure a. 阴暗，模糊 the reasons why he did it are obscure..
42. extent n. 程度，范围，大小，限度 i was amazed at the extent of his knowledgei agree with you to some extent.
我部分同意。
43. exterior n. 外部，外表 a. 外部的，外表的 don't be put off by his gruff exterior.
44. external a. 外部的，外表的，外面的 all his injuries are external.
external causes become operative through internal causes.外因通过内因而起作用。
45. petrol n. 汽油 my car is rather he**y on petrol.
46. petroleum n. 石油 taiwan seems to contain no petroleum.
47. delay vt./n. 推迟，延误，耽搁 our plane was delayed by fog.
48. decent a. 像样的，体面的 he dreamed of living in decent conditions.
49. ruin v. 毁坏，破坏 n. 毁灭，[pl.]废墟 his rashness led ultimately to his ruin.
50. sake n. 缘故，理由 don't inconvenience yourself for my sake.
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