1、We walked in silence up a flight of stairs and down a long corridor.
我們默默地走上一段樓梯，穿過一道長廊。

2、After climbing that long flight of stairs she was completely out of breath.
爬完這么長的一段樓梯后，她已完全喘不過氣來了。

3、Della a climbs the final flight of stairs leading to their tiny apartment.
黛拉在不安中走完了通向他們那面積不大的公寓的最后一級樓梯。

4、Each flight of stairs has 20 steps.
每段階梯有二十級。