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effective
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音标：英 [ɪ'fektɪv] 美 [ɪ'fɛktɪv]
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解释：
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adj. 有效的，起作用的；实际的，实在的；给人深刻印象
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助记提示：
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1. ef- "out" + fect-. 在这里取 out 的引申义：完成、结束(finish, end)之意。
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2. meaning: 事情做完了，事情做结束了. => work out, accomplish.
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3. => 引申为：事情做完、做结束后的结果、效果、作用、影响等。
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4. 做动词就表示：生效、完成、实现、达到、造成等含义。
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5. effect + -ive.
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中文词源：
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effective 有效的来自effect, 效果。
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英文词源：
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effective (adj.)
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late 14c., "serving to effect the intended purpose," from Old French effectif, from Latin effectivus "productive, effective," from effect-, stem of efficere (see effect (n.)). Of military forces, meaning "fit for action or duty" is from 1680s.
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双语例句：
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1. Condoms are an effective method of birth control if used with care.
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如果使用得当，避孕套是很有效的避孕手段。
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来自柯林斯例句
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2. Light colours provide an effective backdrop for pictures or a mirror.
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浅色是挂放图画或镜子很有效果的衬托。
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来自柯林斯例句
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3. Women are sometimes seen to be less effective as managers.
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女性有时被认为不善于管理。
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来自柯林斯例句
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4. The initial image projected was of a caring, effective president.
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他最初表现出的是一个充满爱心、办事有效的总统形象。
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来自柯林斯例句
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5. The bank must be run in a cost-effective way.
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银行的经营必须追求成本效益。
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来自柯林斯例句
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更多相关例句：
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[不可数名词]to check the effectiveness of the security system
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检查安全系统的有效性【牛津词典】
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I admire the effective use of colour in her paintings.
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我很欣赏她绘画作品中的色彩效果。【牛津词典】
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the effective, if not the actual, leader of the party
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虽未居其位却实际上是党的领导人【牛津词典】
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He has now taken effective control of the country.
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他目前已有效地控制了这个国家。【牛津词典】
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The new speed limit on this road becomes effective from 1 June.
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这条路上新的限速规定自6月1日起生效。【牛津词典】
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Long prison sentences can be a very effective deterrent for offenders.
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判处长期徒刑可对违法者起到强有力的威慑作用。【牛津词典】
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Aspirin is a simple but highly effective treatment.
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阿司匹林药片治疗方法简便，效果却非常显著。【牛津词典】
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drugs that are effective against cancer
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治疗癌症的有效药物【牛津词典】
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The new rules will become effective in the next few days.
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新规定将在几天后生效。【柯林斯高阶英语词典】
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...a restructuring that would have resulted in an effective increase on one of their most popular excursion fares.
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原本会使他们最热门的一条短途旅游线路的费用出现实质性上涨的调整【柯林斯高阶英语词典】
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The project looks at how we could be more effective in encouraging students to enter teacher training...
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该项目着眼于我们如何能够更加有效地鼓励学生参与教师培训。【柯林斯高阶英语词典】
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Simple antibiotics are effective against this organism...
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一般的抗生素能够有效对抗这种微生物。【柯林斯高阶英语词典】
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They have had effective control of the area since the security forces left.
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自从安全部队撤离后，他们实际上控制了该地区。【柯林斯高阶英语词典】
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What do you like to do in your spare time?
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空闲时你喜欢干什么?【辞典例句】
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This medicine is effective if used within three years.
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这种药3年以内有效.【《现代汉英综合大词典》】
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Needs assessment is crucial if the hospital is to deliver effective health care.
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医院要提供有效的卫生保健,需求评估是关键.【《简明英汉词典》】
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It was said that she was as effective as god , bringing the dying back to life.
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她是个妙手回春的民间医生.【《现代汉英综合大词典》】
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They have thought out the effective saving.
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他们已想出挽救的办法.【《简明英汉词典》】
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This is an effective medium.
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这是一种有效手段.【《简明英汉词典》】
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The medicine is effective against cancer.
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这药物治癌有效.【《简明英汉词典》】
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The President's speech was an effective apology for his foreign policy.
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总统的演说是对其外交政策的有力辩护.【《简明英汉词典》】
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The description of the fire is very effective.
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对大火的描述极其生动.【《现代英汉综合大词典》】
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This has proved an effective preventive.
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这种药证明是很有效的预防剂.【《简明英汉词典》】
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Dark glasses are an effective shield against the glare.
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墨镜能有效地遮挡强光.【《简明英汉词典》】
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He is one of the most effective writers of our group.
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他是我们组的笔杆子之一.【《现代汉英综合大词典》】
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Royal jelly is effective in treating nervous exhaustion.
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蜂皇精治神经衰弱很有效.【《现代汉英综合大词典》】
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Teamwork is most effective when team members share the same culture.【出自-2017年6月阅读原文】
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Regardless of your stated preference, if you're ready to quit, quitting abruptly is more effective, says Dr.【出自-2017年6月阅读原文】
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Decentralisation of authority was also found to be more effective in military operations.【出自-2017年6月阅读原文】
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may be better at solving puzzlescan memorize things with more easemay have greater facility in abstract reasoningcan put what they have learnt into more effective usefind ways to slow down our mental declinefind ways to boost our memoriesunderstand the complex process of mental functioningunderstand the relation between physical and mental healthThe most important thing in the news last week was the rising discussion in Nashville about the educational needs of children.【出自-2016年6月阅读原文】
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These patterns suggest that some types of mental flexibility decrease relatively early in adulthood, but that the amount of knowledge one has, and the effectiveness of integrating it with one's abilities, may increase throughout all of adulthood if there are no diseases, Salthouse said in a news release.【出自-2016年6月阅读原文】
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There is no effective way to reduce people's sugar consumption.【出自-2016年12月阅读原文】
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The platforms that are most effective turn employees' ordinary job tasks into part of a rich adventure narrative.【出自-2016年12月阅读原文】
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One of the prizes used was a lottery ticket ( ' , 彩票), with a $10, $50 or $100 payout, and this was as effective as a tangible gift in persuading people to eat less.【出自-2016年12月阅读原文】
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In fact, vaguely-stated possibilities of winning a prize were more effective than options with hard odds included.【出自-2016年12月阅读原文】
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He theorizes that it is the emotional component of these intangible prizes that make them effective.【出自-2016年12月阅读原文】
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Focusing on effort is effective in helping children overcome frustration and achieve success.【出自-2016年12月阅读原文】
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To make learning effective, educators have to ensure that children want to learn.【出自-2015年12月阅读原文】
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Passionate, energetic debate does not require anger and hard feelings to be effective.【出自-2015年12月阅读原文】
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In the so-called effective schools, children are taught self-control under a set of strict rules.【出自-2015年12月阅读原文】
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I have visited some of the newer supposedly effective schools, where children shout slogans in order to learn self-control or must stand behind their desk when they can't sit still.【出自-2015年12月阅读原文】
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Find more effective drugs for them.【出自-2010年12月阅读原文】
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social life provides an effective cure for illness【出自-2010年12月阅读原文】
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Complaining in person or by letter is generally more effective.【出自-2010年6月听力原文】
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high-protein breakfasts have been found particularly effective in reducing the longing for food and consumption later in the day, according to research by the Australian Commonwealth Scientific and Industrial Research Organisation.【2019年12月四级真题（第三套）阅读 Section B】
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However, opinions vary on whether video games are effective.【2019年12月四级真题（第二套）听力 Section C】
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I have visited some of the newer supposedly "effective" schools, where children shout slogans in order to learn self-control or must stand behind their desk when they can' t sit still .【2015年12月四级真题（第一套）阅读 Section B】
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If you are familiar with microsoft Excel or a similar program, creating a table is a simple and effective way to keep track of your job applications.【2018年6月四级真题（第一套）听力 Section C】
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Learning by doing may not be efficient, but it is effective.【2019年6月四级真题（第三套）阅读 Section B】
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One of the most effective ways to concentrate is to write things down.【2018年12月四级真题（第一套）听力 Section B】
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One of the prizes used was a lottery ticket, with a $10, $50 or $100 payout, and this was as effective as a tangible gift in persuading people to eat less.【2016年12月四级真题（第三套）阅读 Section C】
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The study looked at computer-assisted cognitive behavioral therapy (CBT) and found that it was no more effective in treating depression than the usual care patients receive from a primary care doctor.【2019年6月四级真题（第三套）阅读 Section C】
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To Fendley, a sense of drive and purpose, as well as an effective high-school education, and basic life skills, like balancing a checkbook, are the necessary ingredients for a successful life in America.【2017年12月四级真题（第三套）阅读 Section C】
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Traditional CBT is considered an effective form of talk therapy for depression, helping people challenge negative thoughts and change the way they think in order to change their mood and behaviors.【2019年6月四级真题（第三套）阅读 Section C】
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While they sound efficient and cost-saving, a recent study reports that they are not effective, primarily because depressed patients are not likely to engage with them or stick with them.【2019年6月四级真题（第三套）阅读 Section C】
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Virtually all experts agree that the fee-for-service system—doctors are rewarded for the quantity of care rather than its quality of effectiveness—is a primary reason that the cost of care is so high.【出自-2016年6月阅读原文】
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