名词
中文翻译：Unknown
同义词：
['contamination', 'pollution', 'discoloration', 'deterioration']
例句：
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1. The factory has been heavily polluting the river with its waste.
工厂一直在用其废物严重污染这条河。
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2. The air quality in this area is severely polluted due to industrial emissions.
由于工业排放，该地区的空气质量严重恶化。
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3. The government has introduced stricter regulations to reduce air pollution.
政府已实施更严格的规定以减少空气污染。