emergency staircase

例句：

1. 1.The emergency staircase is located at the top of the building.
   紧急楼梯位于大楼顶部。
2. 2.In case of an emergency, we need to use the emergency staircase immediately.
   万一发生紧急情况，我们需要立即使用紧急楼梯。
3. 3. The firefighters climbed up the emergency staircase to reach the upper floor.
   消防员爬升紧急楼梯到达上层。