sump是什么意思？

sump

例句

• The acid waste waters are discharged into a sump or the sewerage system. 酸性废水被送往销毁池或阴沟系统.
• An attempt was then made to dive the sump. 之后曾尝试潜入污水坑。
• What if I operate my pump at a very low level for sump cleanout purposes? 如果为了清理污水坑,我不得不使泵运行在低水位,这时会出现什么情况?