potency
n. （人、行动或思想的）影响力，支配力；（男子的）性交能力；（药物等的）效力；（遗传）潜能；发育能力
复数 potencies
例句
If you keep a medicine too long, it may lose its potency.
药物存放太久，可能会失去效力。
《牛津词典》
Sunscreen can lose its potency if left over winter in the bathroom cabinet.
防晒霜在盥洗室柜子里放置一个冬天后会失去效力。
《柯林斯英汉双解大词典》
As the structural nature of public health problems becomes harder to ignore, the complaint about over protective government loses potency.
随着公共卫生的结构性问题越来越难以忽视，对政府过度保护的控诉便失去了效力。
