n. 杂质（impurity的复数）

n worthless or dangerous material that should be removed
n the condition of being impure

impurities的用法和样例：

例句

用作名词(n.)

Filtering the water removed some of its impurities.把水过滤一下除去了一些杂质。
Workers are removing impurities from silver.工人们正去除银中的杂质。

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