staircase with several flights

例句：

1. 1.The grand staircase leads to the main hall.
   宏伟的楼梯通向主厅。
2. 2.She climbed up the stairs to reach the top floor.
   她爬上楼梯到达顶楼。
3. 3. The old man sat on the staircase and watched the sunset.
   老人坐在楼梯上看着日落。