The pollutants derive from a wealth of sources, including agriculture, factory discharges, consumer products, urban runoff and wastewater treatment plants.
污染物质的来源广泛，包括农业、工厂排放物、消费产品、城市河道和污水处理工厂。
The urban sewer systems and the wastewater treatment plants have detrimental impacts on the receiving river water quality.
城市排水管网与污水处理厂的运行状态直接影响受纳河流的水质。
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