stepped ageing

例句：

1. 1.The stairs are steep and challenging to climb.
   楼梯陡峭且难以攀登。
2. 2. He climbed the stairs to reach the top floor.
   他爬上楼梯到达顶层。
3. 3.The ladder was too short for her to reach the roof.
   梯子太短，她够不到屋顶。