名词
中文翻译：不纯净
同义词：
['impurity', 'impurity', 'uncleanness']
例句：
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1.The water was found to be impure and should not be used for drinking.
水被发现是不纯净的，不应该用来饮用。
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2. The food was found to be impure and should not be eaten by children.
食物被发现是不纯净的，不应该让儿童食用。
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3.The air was found to be impure and should be filtered before being inhaled.
空气被发现是不纯净的，应该过滤后再吸入。