山口

例句：

1. 1. The mountain pass is a popular hiking trail.
   这座山口是一条受欢迎的徒步旅行路线。
2. 2. The river flows through the narrow mountain pass.
   这条河流流经狭窄的山口。
3. 3. The hikers reached the top of the mountain pass before sunset.
   登山者在日落前到达了山顶的山口。