impurity
US /ɪmˈpjʊr.ə.t̬i/
UK /ɪmˈpjʊr.ə.t̬i/
1.
tạp chất
the fact that a substance is dirty or lower in quality because it is mixed with another substance, or something that causes this:
:
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Impurities are removed from the blood by the kidneys.