watercourse [ˈwɔ:tərkɔ:rs]

例句:

• This species of fish successfully transferred to that river through a watercourse.
  这种鱼成功地通过一条水道到了那条河流。
  
• The waste repository was usually the nearest watercourse.
  废物容纳地点一般是离城市最近的水域.
  
• A watercourse that feeds water into a mill, water wheel, or turbine.
  一种把水从磨房或水轮或涡轮放出的水渠.