名词
中文翻译：外部污染
同义词：
['environmental pollution', 'external contamination']
例句：
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1. The company's decision to invest in renewable energy has raised concerns about external contamination.
该公司决定投资可再生能源的决定引起了对外部污染的担忧。
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2.The government is working on a plan to reduce external contamination in the city.
政府正在制定一个计划，以减少城市中的外部污染。
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3.The research team found that the presence of bacteria in the soil could be a source of external contamination for nearby crops.
研究小组发现，土壤中细菌的存在可能是附近作物受到外部污染的原因。