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head gate

资料来源 : WordNet®

head gate
     n 1: regulator consisting of a valve or gate that controls the
          rate of water flow through a sluice [syn: {sluicegate},
          {sluice valve}, {floodgate}, {penstock}, {water gate}]
     2: a gate upstream from a lock or canal that is used to control
        the flow of water at the upper end
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