the ability of something to produce the results that are wanted 功效；效验；效力 to evaluate the efficacy and safety of the treatment 评估治疗的有效性和安全性
Word Originearly 16th cent.: from Latin efficacia, from efficax, efficac-, from efficere ‘accomplish’, from ex- ‘out, thoroughly’ + facere ‘do, make’.
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efficacy
Usefulness and efficiency: usefulness, efficiency, effectiveness...
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