sump

sump
noun
  1. a pit or hollow in which liquid collects, in particular
    集水坑,尤指
    ■the base of an internal-combustion engine, which serves as a reservoir of oil for the lubrication system
    (内燃机润滑系统的)集油槽,油底壳
    ■a depression in the floor of a mine or cave in which water collects
    (矿井,山洞中的)水窝
    ■a cesspool
    污水坑
语源
  1. Middle English (in the sense 'marsh'): from Middle Dutch or Low German sump, or (in the mining sense) from German Sumpf; related to swamp
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