stairs

楼梯；梯级（stair的复数）中释n

1 flight of stairs,阶梯步级

2 down stairs,下楼

1 The boy thumped down the stairs..小男孩咚咚地跑下楼梯。

2 The suitcase bounced down the stairs..衣箱一路颠跳着滚下楼梯。

3 The children pattered down the stairs..孩子们啪嗒啪嗒地跑下楼梯。