名词
中文翻译：污水
同义词：
['wastewater', 'effluent', 'sewer water例句：1. The city has been working on improving its sewage treatment system.（该城市一直在努力改善其污水处理系统。）']
例句：
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1. The city has been working on improving its sewage treatment system.
该城市一直在努力改善其污水处理系统。
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2.The sewage from the industrial area is a major concern for the environment.
工业区的污水是环境的一大关注点。
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3. The sewage was treated before it was discharged into the river.
污水在排放到河流之前已经处理过。