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新东方-柯林斯雅思备考词典
impurity
英 [ɪmˈpjʊərɪti]
[NOUN]
impurities
1. [C 可数名词] 杂质
Impurities are substances that are present in small quantities in another substance and make it dirty or of an unacceptable quality.
双语例句
例：The air in the factory is filtered to remove impurities.
工厂里的空气经过过滤去除杂质。