point source of pollution

例句：

1. 1.The factory is the main source of pollutionin the area.
   这个工厂是该地区的主要污染源。
2. 2. The city has been working toreduce its point sources of pollution.
   该市一直在努力减少其污染点。
3. 3. The scientistsidentified several potential sources of contamination.
   科学家们确定了几个潜在的污染源。