couloir

例句：

1. 1.The hikers carefully descended the steep couloir to reach the bottom.
   登山者小心翼翼地沿着陡峭的峡谷下降，到达底部。
2. 2. The river flows through a deep couloir, providing a scenic route for hikers.
   这条河流穿过一个深峡谷，为徒步旅行者提供了一条风景如画的路线。
3. 3. The engineers were working on expanding the couloir to accommodate more traffic.
   工程师们正在努力扩大峡谷以容纳更多的交通流量。