fouling of heating surface

例句：

1. 1. The factory hasbeen found to have fouled the airwith toxic chemicals.
   工厂被发现用有毒化学物质污染了空气。
2. 2. The river has been fouled by industrial waste.
   这条河被工业废物污染了。
3. 3. The company is being investigatedfor fouling the environment.
   该公司正在接受调查，涉嫌污染环境。