暗渠

例句：

1. 1. The engineer designed a new drainage system for the construction site.
   工程师为工地设计了一个新的排水系统。
2. 2. The underground water channels are essential for maintaining the ecological balance of the area.
   地下水道对于维护该地区的生态平衡至关重要。
3. 3. The construction crew had to excavate a deep ditch to access the water source.
   施工队不得不挖掘一条深沟以到达水源。