ef·fi·ca·cious
adjective/ˌefɪˈkeɪʃəs/
/ˌefɪˈkeɪʃəs/
(formal)- (of things, not of people) 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. - They hope the new drug will prove especially efficacious in the relief of pain.