Currents in rivers,lakes,and oceans spread pollutants that are dumped into water. Pollution in soil can seep into ground water and appear later in wells..

• 河流、湖泊和海洋中的水流能够扩散倾卸于水中的污染物，土壤中的污染成分能够渗透到地下水中，并且以后会出现在井水里。