impurity
US /ɪmˈpjʊr.ə.t̬i/
UK /ɪmˈpjʊə.rə.ti/
名词
不纯
the fact that a substance is dirty or lower in quality because it is mixed with another substance, or something that causes this:
示例:
•
Impurities are removed from the blood by the kidneys.