| 正面 | 1135.effective 英 [ɪ'fektɪv]美 [ɪ'fɛktɪv]     |
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| 背面 |     释义： 1. ef- "out" + fect-. 在这里取 out 的引申义：完成、结束(finish, end)之意。2. meaning: 事情做完了，事情做结束了. => work out, accomplish.3. => 引申为：事情做完、做结束后的结果、效果、作用、影响等。4. 做动词就表示：生效、完成、实现、达到、造成等含义。5. effect + -ive.adj. 有效的，起作用的；实际的，实在的；给人深刻印象 例句： 1. Condoms are an effective method of birth control if used with care.如果使用得当，避孕套是很有效的避孕手段。 effective 有效的来自effect, 效果。 effective (adj.)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." |