sluice·way /ˈslusˌwe/
  閘溝,人造水道
  Sluice·way n. An artificial channel into which water is let by a sluice; specifically, a trough constructed over the bed of a stream, so that logs, lumber, or rubbish can be floated down to some convenient place of delivery.
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  sluiceway
       n : conduit that carries a rapid flow of water controlled by a
           sluicegate [syn: sluice, penstock]