channel precipitation

例句：

1. 1.The river is the main channel for transportation in this area.
   这条河是该地区交通的主要通道。
2. 2. The scientist used a channel to divert water from the lake.
   科学家使用一条管道将水从湖中引走。
3. 3. The engineer designed a channel to accommodate the new bridge.
   工程师设计了一条通道来容纳新桥。