名词
中文翻译：不纯
同义词：
['contamination', 'impurity']
例句：
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1.The water was so polluted that it could not be used for drinking.
水被污染到无法饮用的程度。
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2. The food was contaminated with bacteria and made the people sick.
食物被细菌污染，导致人们生病。
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3. The air is becoming more and more impure due to pollution.
由于污染，空气变得越来越不纯。