sludge well

例句：

1. 1. The sludge well was filled with a thick layer of slimy mud.
   污泥井里积满了厚厚的一层黏糊糊的泥。
2. 2.The engineers were inspecting the sludge well for leaks.
   工程师们正在检查污泥井是否有泄漏。
3. 3. The sludge well was a source of concern for environmentalists.
   污泥井是环保人士关注的问题。