名词
中文翻译：污染
同义词：
['contamination', 'pollution', "discoloration例句：1. The factory's wastewater is a major source of pollution in the river.（这家工厂的废水是这条河流的主要污染源。）2. The air pollution has become a serious problem in many cities.（空气污染已成为许多城市的一个严重问题。）"]
例句：
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1. The factory's wastewater is a major source of pollution in the river.
这家工厂的废水是这条河流的主要污染源。
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2. The air pollution has become a serious problem in many cities.
空气污染已成为许多城市的一个严重问题。
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3. The government has introduced strict measures to control air pollution.
政府已经采取了严格的措施来控制空气污染。