drain channel

例句：

1. 1.The drain channel needs to be cleaned regularly to prevent blockages.
   排水沟道需要定期清理以防止堵塞。
2. 2. The construction of the new highway will significantly improve the drainage channel system.
   新高速公路的建设将显著改善排水沟道系统。
3. 3. The engineer designed a unique drainage channel that effectively solved the problem.
   工程师设计了一个独特的排水沟道，有效地解决了这个问题。