n.效力；潛能；權(quán)力
Alcohol increases the drug's potency. 酒精能增加這種毒品的效力。
If you keep a medicine too long, it may lose its potency. 藥物存放太久，可能會(huì)失去效力。
n.無(wú)力；無(wú)效；性無(wú)能
