pollution by manganese

例句：

1. 1. The factory is heavilypolluting the air with its heavyemissions.
   这家工厂的重排放严重污染了空气。
2. 2. The river has been severely polluted due to industrial waste.
   由于工业废物，这条河流已经严重污染了。
3. 3. Thegovernment has taken steps to reduce pollution inthe city.
   政府已采取措施减少城市污染。