| 正面 | efficacious |
|---|---|
| 背面 | 【考法 1】adj.有效的: having the power to produce a desired effect 【例】Taking break with a cup of coffee while studying is one of the most efficacious ways of rejuvenating the mind that I have ever discovered. 在紧张的学习中休息一会，喝杯咖啡，是我发现的最能提神的方法之一。 【近】effective, effectual, efficient, fruitful, operative, potent, productive 【反】bootless, fruitless, ineffective, ineffectual, inefficient, inoperative, unproductive, useless 无效的 |
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