n.不純；雜質(zhì)

Impurity of the water made it unfit to drink. 因?yàn)樗|(zhì)不純凈，所以不能飲用。

The impure mixture with impurity is purified. 含雜質(zhì)的不純混合物被提純。

There are some impurities in food. 食物中有一些雜質(zhì)。

Workers are removing impurities from silver. 工人們正去除銀中的雜質(zhì)。