动词
中文翻译：使不洁
同义词：
['contaminate', 'soil', 'pollute']
例句：
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1.The river has been befouled by the factory's waste.
这条河被工厂的废物污染了。
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2.The workers were befouled with oil and dirt.
工人们被油和泥弄脏了。
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3. The animals are being befouled by the pollution from the factories.
动物们正被工厂的污染所困扰。