考研英语词汇复习（7）
形容词effective、efficient和valid
佳中
这组词都可表示“有效的”意思。
effective 指某事能产生显著或理想的效果，其名词是effectiveness。
1) All these methods have proved to be effective in controlling the growth of population.
（所有这些方法都证明能有效控制人口的增长。）
2) Taking the seriousness of the problem into consideration, we must adopt some effective measure to solve it before it deteriorates.
（考虑到这一问题的严重性，我们必须采取一些有效的措施在问题恶化之前予以解决。）
3) Several additional experiments are to be performed to prove the effectiveness of the new drug.
（计划再做一些附加试验以证明新药的有效性。）
efficient 指能产生较高效率，其名词是efficiency。
1) Our profits will not increase unless we introduce more efficient techniques in the production.
(如果我们在生产中不引进效率更高的技术，我们就不可能增加利润。)
2）It is claimed that with this approach the memory can be made ten times more efficient.
（据称用这种做法记可使效率提高十倍以上。）
3) These technologies have greatly raised the efficiency of the clerical work in offices.
（这些技术大大地提高了办公室文书工作的效率。）
valid ① 指法律概念意义上的有效，其名词是validity。② 指理论、观点、结论等能站得住，、是正确的。
1) The will is not considered to be valid as there was only one witness present when it was written.
2) The lawyer questioned the validity of the contract, as he found that it had already expired.
（律师质疑合同的有效性，因为他发现它已经过期了。）
3) I don’t think their argument is valid since they have not set forth sufficient evidence to support it.
（我认为他们的论点是站不得住脚的，因为他们没有提出充分的证据能支持论点。）
4) When the news of UFO sighting was broadcast on the radio, some listeners called to challenge the validity of it.
（当不明飞行物出现的消息在无线电广播后，一些听众打电话质疑其真实性。）
invalid
void
这两个形容词的意思是“无效的”。
（法庭判决遗嘱无效，因为只有一个见证人。）
2) Upon its expiration, the contract shall automatically become void and null.
（本合同到期后自动失效。）
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