名词
中文翻译：Unknown
同义词：
['polluted sewage', 'treated wastewater', 'stabilized wastewater']
例句：
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1. The city has been working on improving its sewage treatment facilities.
该市一直在努力改善其污水处理设施。
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2.The sewage from the industrial area is a major source of pollution.
工业区的污水是主要的污染源。
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3. The government has set up a new sewage treatment plant to reduce the amount of pollutants in the river.
政府已经建立了一个新的污水处理厂，以减少河流中的污染物。