n.污水坑；水坑；机油箱

Never pipe the discharge line directly into a drainage ditch, sewer or sump. 不要把排泄管直接插入排泄地漏、污水管或污水坑里。

A physical air gap must be maintained between the discharge pipe and the drain or sump. 必须在排放管道和排水沟或污水坑之间配置一个硬件气隙。

With the purpose of dewatering , we use sump. 基坑内采用集水坑排水。

The damaged sump spouted dirty oil . 受损的油槽里喷出了污浊的原油。