油底殼, 集水坑, 污水池
a pit or hollow in which liquid collects, especially one in the floor of a workshop into which waste oil and water drain.
:
• The mechanic drained the oil into the sump.
機械師把油排到油底殼裡。
• Water collected in the basement sump after the heavy rain.
大雨過後，水積聚在地下室的集水坑中。
