fire-escape stair

例句：

1. 1. The fire-escape stair is the first thing we need to check when a fire breaks out.
   在火灾发生时，我们首先需要检查的是逃生楼梯。
2. 2. The building has several fire-escape staircases on each floor.
   这座建筑的每个楼层都有好几个逃生楼梯。
3. 3. The firefighters used the fire-escape stair to get to the upper floors quickly.
   消防员们使用逃生楼梯迅速到达了上层。