efficacious
adj. 有效的；灵验的
例句
The nasal spray was new on the market and highly efficacious.
这种鼻腔喷雾剂是市场新品，非常有效。
《柯林斯英汉双解大词典》
One such factor is the evolution of downsizing into a powerful business myth: managers simply believe that downsizing is efficacious.
其中一个因素就是缩小规模已经演变成一个强大的商业神话：经理们单纯地相信缩小规模是有效的。
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。
《牛津词典》
