pervious cesspool

例句：

1. 1. The city has been working to clean up the pervious cesspools in the area.
   该市一直在努力清理该地区的以前的污水池。
2. 2.The old septic tank was a source of concern for many years.
   旧化粪池多年来一直是许多人担忧的问题。
3. 3. The new septic system is expected to significantly reduce pollution from the previous cesspools.
   新的污水处理系统预计将显著减少以前污水池的污染。