scum vessel

例句：

1. 1.The sewage system is designed to filter out the scum from the city's wastewater.
   这个污水处理系统设计用来过滤掉城市废水中的污物。
2. 2. The engineer inspected the scum vessel and found it to be in good condition.
   工程师检查了污物容器，发现它状况良好。
3. 3.The scum vessel was cleaned out and the workers were happy to see a clean space.
   污物容器被清理干净了，工人们很高兴看到干净的空间。