名词
中文翻译：Unknown
同义词：
['contamination', 'impurity']
例句：
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1.The water was contaminated with chemicals from the factory.
水被工厂的化学物质污染了。
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2. The food was contaminated by bacteria.
食物被细菌污染了。
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3.The soil was heavily contaminated with heavy metals.
土壤被重金属严重污染了。