"污染" 英文为 "pollution"。这个词来源于拉丁语"pollue"，意思是"弄脏"。
例句：
Air pollution is a major problem in many cities. (空气污染是许多城市的主要问题)
Water pollution is causing the fish population to decpne. (水污染导致鱼类数量减少)
The factory was closed down due to its pollution of the local river. (工厂因对当地河流的污染而被关闭)