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sterile［ˈsterail;ˈsterəl］adj. 不能生殖的，不育的；（指土地）不毛的，贫瘠的；无结果的，无效的；无菌的，消过毒的
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【例】①Many people in that sterile place are suffering hunger.
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②There has been a big jump in the number of operations cancelled because of a lack of sterile surgical instruments.
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【派】sterility（n. 贫瘠；无生殖力；无菌）；sterilize（v. 为…消毒或杀菌；使绝育）
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operative［ˈɔpərətiv］adj. 有效的，起作用的；操作的；运行着的
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【记】词根记忆：oper（工作） + ative→可以工作的→起作用的
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【例】①We hope the new system will be operative in February.
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②the operative word 最关键的词 The operative word in that advertisement is “low-fat”.
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communicable［kəˈmjuːnikəbl］adj. （思想、感觉等）易于传达的；（疾病）可传染的
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【记】词根记忆：com（共同） + mun（公共的） + ic + able→在公众场合下的→易于传达的
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【例】The communicable disease caused many people to die but now nobody found the reason of the disease.
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halt［hɔːlt］n. 暂停前进；中止，停止 vi. 停止前进；停止，停住
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【例】①Coastal and river ice brought a halt to shipping in northern Europe. （1996）
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②bring to a halt 停顿下来 Work was brought to a halt when the director came on Monday.
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③call a halt 暂停 Let’s call a halt to the contest and continue next week.
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curt［kəːt］adj. （言词）简短的；草率无礼的
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【例】Tom made a curt answer to the serious question.
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factitious［fækˈtiʃəs］adj. 不自然的，人为的
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【记】词根记忆：fact（做） + it + ious→它是做出来的→人为的
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【例】The relevant department must find some ways to deal with the factitious prosperity in the stock market.
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premature［ˌpreməˈtjuə；ˌpriːməˈtjuə］adj. 过早的，提前的；不成熟的；仓促的
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【记】词根记忆：pre（预先） + mature（成熟的）→比预期时间早的→提前的
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【例】①How can governments help people conserve their health and avoid premature death?（2001）
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②I made several premature attempts, and all were failures.
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warrant［ˈwɔrənt］n. 授权（证）；逮捕状，搜查令；（正当）理由 vt. 使有正当理由；向…保证
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