1. The stairs ascended in a graceful curve.
   楼梯以优美的曲线上升。
2. Climbing all these stairs is a real sweat.
   登上所有这些楼梯可真费力气.
3. The top stair is broken.
   楼梯最上面的一级坏了.
4. Where were you a moment ago ? I was up stairs .
   刚才你在哪里?我在楼上。
5. The old lady can mount the stairs only with difficulty.
   那位老妇人要用很大的力气才能上楼。

　1个名词解释