求翻译：径流携带的来自城市路面沉积物、重金属、营养物、毒性有机物等污染物成为城市受纳水体水质下降的重要污染源是什么意思？

From urban road sediments, heavy metals, nutrients, toxic organics and other pollutants into urban runoff carried by the decline of important sources of water quality in water bodies

Runoff from urban roads carry sediment, nutrients, heavy metals and toxic organic pollutants, such as the water in the city water quality in the important sources of pollution

The runoff carryhome comes from city pollutant and so on road surface deposit, heavy metal, nourishing substance, toxic organic matter becomes the city to judge whether the direction of water flow is lucky the important source of pollution which the body water quality drops

Carried by runoff from urban surface sediment, heavy metals, nutrients, pollutants such as toxic organic matter become important urban receiving waters reduced water quality pollution

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