polluted belts along river banks

例句：

1. 1. The river is heavily polluted with industrial waste.
   这条河被工业废物严重污染。
2. 2. The air quality in this area is very polluted due to the nearby factory.
   由于附近的工厂，这个地区的空气质量非常差。
3. 3. The government has taken steps to clean up the polluted land and restore its natural beauty.
   政府已经采取措施清理污染的土地并恢复其自然美景。