canal  
noun [ C ] uk/kəˈnæl/ us/kəˈnæl/
  (WATER ROUTE)      
 B1 运河;渠
a long, thin stretch of water that is artificially made either for boats to travel along or for taking water from one area to another
  The Panama Canal provides a crucial shipping link between the Atlantic and Pacific oceans. 巴拿马运河是连接大西洋和太平洋至关重要的航道。 
 See also: alimentary canal 
 - More examples
 - They found the man's body after dragging the canal.
 - They have to dredge the canal regularly to keep it open.
 - She lives in a narrow boat on a canal.
 - We walked along the canal for a couple of miles.
 - In order to turn the deserts into fertile and productive land, engineers built an 800-mile canal.
 
  (TUBE IN BODY)      
 medical specialized管,道 
a narrow tube through which air, fluid, or other substances can pass
  The alimentary canal is the path by which food enters the body, and solid waste is passed out. 消化道是食物进入身体,固体废物排出身体的通道。