impurity
/ɪmˈpjʊərətɪ/noun
(pl. -ies)［mass noun］
1- the quality or condition of being impure不纯, 不洁。
1.1
- count noun a thing or constituent which impairs the purity of something杂质, 混杂物：
aluminium and lead are impurities frequently found in tap water.
铝和铅是自来水中常见的杂质。
1.2
- count noun Electronics a trace element deliberately added to a semiconductor; a dopant【电子】掺杂剂。
词源
late Middle English: from French impurite or Latin impuritas, from impurus （see IMPURE）.