wa·ter·course /ˈwɔtɚ/
水道,河道
Wa·ter·course n. Shipbuilding One of the holes in floor or other plates to permit water to flow through.
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watercourse
n 1: natural or artificial channel through which water flows
2: a natural body of running water flowing on or under the
earth [syn: stream]
3: a conduit through which water flows [syn: waterway]