The act or process of polluting or the state of being polluted, especially the contamination of soil, water, or the atmosphere by the discharge of harmful substances.
污染造成污染的行为或过程或被污染的状态, 尤指因为排放有害物质而造成的对土壤、水或大气的污染
Why not stop them (from) polluting the river?
为什么不阻止他们污染这条河呢？
That's what's polluting the lake.
那就是污染湖水的东西。
