(of things, not of people 指物，不指人 producing the result that was wanted or intended 有效的；奏效的；灵验的 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。
Word Originearly 16th cent.: from Latin efficax, efficac- (from efficere ‘accomplish’, from ex- ‘out, thoroughly’ + facere ‘do, make’) + -ious.
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efficacious
Useful and effective and working correctly: useful, efficient, effective...
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