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producing the result that is wanted or intended; producing a successful result 产生预期结果的；有效的 Aspirin is a simple but highly effective treatment. 阿司匹林药片治疗方法简便，效果却非常显著。 Some people believe that violence is an effective way of protesting. 有些人认为暴力是抗议的有效方式。 an effective means/strategy/tool/method 有效的手段/策略/工具/方法 I admire the effective use of colour in her paintings. 我很欣赏她绘画作品中的色彩效果。 The system has proved less effective than hoped. 该系统被证明不如预期的那样有效。 - effective against something
drugs that are effective against cancer 治疗癌症的有效药物
Extra ExamplesTopics Successb1, Change, cause and effectb1Long prison sentences can be a very effective deterrent for offenders. 判处长期监禁可对违法者起到强有力的威慑作用。 This method is effective enough with greenfly. 这种方法足以对付蚜虫。 We find advertising on the radio very effective. 我们发现在收音机里做广告很有用。 What makes a TV programme politically effective? 什么能使一个电视节目产生政治效应？ a particularly effective technique 一种特别有效的技术 effective at keeping out the wind 能有效地挡风 effective in helping people to stop smoking 有效地帮助人们戒烟 The vaccines will be safe and effective if used properly. 如果使用得当，疫苗将是安全有效的。
Oxford Collocations Dictionaryverbs- be
- look
- prove
- …
- extremely
- fairly
- very
- …
- at
- in
- [only before noun]
in reality, although not officially intended 实际的；事实上的 the effective, if not the actual, leader of the party 虽未居其位却实际上是党的领导人 In spite of what they are told, parents have no effective choice of schools. 不管他们被告知什么，父母没有有效的学校选择。 He has now taken effective control of the country. 他目前已实际上控制了这个国家。
- (formal)
(of laws and rules 法律和规则 coming into use 生效的；起作用的 Oxford Collocations Dictionaryverbs- be
- become
- remain
- …
- fully
- partially
- directly
- …
Word Originlate Middle English: from Latin effectivus, from efficere ‘accomplish’, from ex- ‘out, thoroughly’ + facere ‘do, make’.