airstairs

例句：

1. 1. The airstairs are the only way to reach the top floor.
   楼梯是到达顶楼的唯一途径。
2. 2.The elevator is located in the airstairs of the building.
   电梯位于大楼的楼梯间。
3. 3. She went down the airstairs to meet her friend at the entrance.
   她走下楼梯去门口会见她的一个朋友。