stream contamination of wind tunnel

例句：

1. 1.The stream is contaminated with pollutants from the nearby factories.
   这条小溪被附近的工厂排放的污染物污染了。
2. 2. Contamination of water sources has become a major environmental concern.
   水源的污染已成为主要的环保问题。
3. 3. The government is working to reduce the contamination of our rivers and lakes.
   政府正在努力减少我们河流和湖泊的污染。