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。
Runoff collecting irrigation agriculture rapidly rises in the last stage of the eighth five year plan in northwestern arid and semi arid region, and it plays an active role in promoting grain output.
集流灌溉农业是“八五”末期在我国西北干旱、半干旱地区迅速兴起的农业灌溉方式，对该区增产粮食起到积极推动作用。
Urban surface runoff is the second large non-point pollution source next to agriculture.
城市地表径流是仅次于农业面污染源的第二大面污染源。
Urban surface runoff is the second large non-point pollution source next to agriculture.
城市地表径流是仅次于农业面污染源的第二大面污染源。
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