one-way ramp

例句：

1. 1.The one-way ramp is the only way to get to the top of the mountain.
   单向坡道是到达山顶的唯一途径。
2. 2.The construction crew used a one-way ramp to move heavy equipment up the hill.
   施工队使用单向坡道将重型设备运上山。
3. 3. The one-way ramp was designed to prevent vehicles from backing into each other.
   单向坡道设计用来防止车辆相互碰撞。