the quality or condition of being impure
不纯,不洁。
[count noun]a thing or constituent which impairs the purity of something
杂质,混杂物
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aluminium and lead are impurities frequently found in tap water .铝和铅是自来水中常见的杂质。
[count noun]
【电子】 掺杂剂。
"late Middle English: from French