词汇与表达：contaminate-pollute

contaminate
If something is contaminated by dirt, chemicals, or radiation, they make it dirty or harmful.
Have any fish been contaminated in the Arctic Ocean?
北冰洋的鱼受到过污染吗？
记忆技巧：contamin 污染 + ate 表动词 → 弄脏，污染

contamin= to pollute 污染
contaminant n. 致污物，污染物
contamin 污染 + ant …物 → 致污物，污染物
contaminate v. 弄脏，污染
contamin 污染 + ate 做，造成，使… → 弄脏，污染
contamination n. 污染，玷污
contaminate的名词
contaminator n. 弄脏者；致污物，污染物
contamin 污染 + ator 表名词 → 弄脏者；致污物，污染物
decontaminate v. 排除污染，净化
de 去掉 + contaminate 弄脏，污染 → 排除污染，净化

These gases pollute the atmosphere of towns and cities.
这些气体污染了城镇的空气。