efficacious
/ˌɛf.əˈkeɪ.ʃəs/ 形容词 C2中文： 有效、管用、奏效、灵验
- Effective; possessing efficacy. · This medicine is efficacious.
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“I fancy that he had taken steps to make that draught efficacious, and that he quite relied upon your being unconscious.
He has but one fault, he is somewhat wilful; but really, on referring for the moment to what he said, do you truly believe that Mithridates used these precautions, and that these precautions were efficacious?”
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