1 ADJ-GRADED 有效的;能产生预期效果的 Something that is effective works well and produces the results that were intended. 有效的;能产生预期效果的
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The project looks at how we could be more effective in encouraging students to enter teacher training. [+ in]
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。
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Simple antibiotics are effective against this organism. [+ against]
一般的抗生素能够有效对抗这种微生物。
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...an effective public transport system.
有效运转的公共交通系统
SYN efficient, successful, useful, active
2 ADJ [ADJ n] 实际的;事实上的 Effective means having a particular role or result in practice, though not officially or in theory. 实际的;事实上的
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They have had effective control of the area since the security forces left.
自从安全部队撤离后，他们实际上控制了该地区。
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...a restructuring that would have resulted in an effective increase on one of their most popular excursion fares.
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
SYN virtual, essential, practical, implied
3 ADJ [verb-link ADJ] （法律、协议等）生效的，起作用的 When something such as a law or an agreement becomes effective, it begins officially to apply or be valid. （法律、协议等）生效的，起作用的
SYN in operation, official, current, legal
| Usage | effective and efficient |
| Effective and efficient are often confused. If you are effective, you get the job done properly; if you are efficient, you get the job done quickly and easily: Doing research at the library can be effective, but using the Internet is often more efficient. |
| Word Partnership | Use effective with: |
| N. | effective means, effective method, effective treatment, effective use 1 |
| ADV. | highly effective 1 effective immediately 3 |
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