记忆方法
1. ef- "out" + fic- + -acy. 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、做结束后的效果。=> 效果、功效。
4. efficacy + 变 y 为 i 加 -ous.
2. meaning: 事情做完了，事情做结束了. => work out, accomplish.
3. => 引申为：事情做完、做结束后的效果。=> 效果、功效。
4. efficacy + 变 y 为 i 加 -ous.
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词族 · efficacious
英语词源
- efficacious
-
efficacious: see effect
- efficacious (adj.)
- "sure to have the desired effect" (often of medicines), 1520s, from Latin efficaci-, stem of efficax "effectual, powerful" (see efficacy) + -ous. Related: Efficaciously; efficaciousness.
权威例句
- 1. They hope the new drug will prove especially efficacious in the relief of pain.
- 他们希望这种新药能在缓解疼痛方面产生特效。
- 2. It occurs to me that example is always more efficacious than precept.
- 我想到身教重于言教.
- 3. Qingdao is a resort efficacious for a variety of bodily ills.
- 青岛是一个对各种身体疾病都有疗效的疗养胜地.
- 4. This medicine is highly efficacious.
- 这药很灵验.
- 5. Vaccination for smallpox is efficacious.
- 种牛痘防天花是有效的.