emergency ladder

例句：

1. 1.We need to use the emergency ladder to reach the top of the building.
   我们需要使用紧急梯子到达大楼顶部。
2. 2. The firefighters used the emergency ladder to rescue the trapped people.
   消防员们使用紧急梯子来营救被困的人们。
3. 3. The ladder was used as an emergency escape route in case of a fire.
   在火灾发生时，这个梯子被用作紧急逃生路线。