sludge oil tar

例句：

1. 1. The factory produces a lot of sludge oil tar.
   这家工厂生产大量的污泥油渣。
2. 2. The wastewater treatment plant needs to remove the sludge oil tar before discharge.
   污水处理厂在排放前需要去除污泥油渣。
3. 3. The sludge oil tar is a serious environmental problem that needs to be addressed.
   污泥油渣是一种严重的环境问题，需要得到解决。