efficacious

英 [,ef?'ke???s] 美
  • adj. 有效的；靈驗(yàn)的
GRE暢通詞匯

助記提示

1. ef- "out" + fic- + -acy. 在這里取 out 的引申義：完成、結(jié)束(finish, end)之意。
2. meaning: 事情做完了，事情做結(jié)束了. => work out, accomplish.
3. => 引申為：事情做完、做結(jié)束后的效果。=> 效果、功效。
4. efficacy + 變 y 為 i 加 -ous.

英文詞源

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.

雙語(yǔ)例句

1. They hope the new drug will prove especially efficacious in the relief of pain.
他們希望這種新藥能在緩解疼痛方面產(chǎn)生特效。

來(lái)自《權(quán)威詞典》

2. It occurs to me that example is always more efficacious than precept.
我想到身教重于言教.

來(lái)自《簡(jiǎn)明英漢詞典》

3. Qingdao is a resort efficacious for a variety of bodily ills.
青島是一個(gè)對(duì)各種身體疾病都有療效的療養(yǎng)勝地.

來(lái)自《簡(jiǎn)明英漢詞典》

4. This medicine is highly efficacious.
這藥很靈驗(yàn).

來(lái)自《現(xiàn)代漢英綜合大詞典》

5. Vaccination for smallpox is efficacious.
種牛痘防天花是有效的.

來(lái)自《現(xiàn)代英漢綜合大詞典》