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1.The city has implemented a combined sewerage system to improve its wastewater treatment efficiency.
该城市实施了一个综合污水系统，以提高其废水处理效率。
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2. The new combined sewerage system is expected to reduce the amount of pollutants in the river.
新实施的综合污水系统预计将减少河流中的污染物含量。
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3. The city's decision to adopt a combined sewerage system was met with mixed reactions from residents.
该市决定采用综合污水系统的决定，引起了居民的混合反应。