pollute
/pəˈlu:t; pə`lut/ v[Tn, Tn.pr]
~ sth (with sth)
1 make sth dirty or impure, esp by adding harmful or unpleasant substances 污染或弄脏某物或使某物含有杂质（尤指因搀入有害的或不好的物质）
rivers polluted with chemical waste from factories 受到工厂排放的化学废料污染的河流
polluted water, ie unfit to drink 污染的水（不宜饮用）.
2 (fig 比喻) destroy the purity or sanctity of sth; corrupt 玷污或亵渎某事物; 败坏
pollute the minds of the young with foul propaganda 宣传不良事物腐蚀青年人的思想.