stairs是复数还是单数

stairs是复数

1、

which was rather a slow journey， on account of Paul being obliged to land both feet on every stair， before he mounted another.

这是一段相当缓慢的路程，因为保罗必须把两只脚都跨到每个梯级以后才能攀登另一个梯级。

2、

Some Viewpoints about Stair Promoting Form of Regional Economic Co-operation in China

论我国区域经济合作的梯级推进形式

stairs是复数还是单数

stairs是复数。

Tripping the pensioner on the stair .

使得老人一下绊倒在楼梯上。

I just about managed to get up the ；stairs ；.我总算挣扎着上了楼。

He tore up the ；stairs ；two steps at a time .他一步两个台阶地飞奔跑上楼。

She fell head first down the ；stairs ；.她摔倒了，一头栽下楼梯。

Fagin stealthily descended the kitchen ；stairs ；.费根蹑手蹑足了厨房的楼梯。

Then i went up the ；stairs ；with tatu .然后，塔图陪我上楼去了。

He made excuses to linger on the ；stairs ；.他找借口故意在楼梯口上磨磨蹭蹭。

She was out of breath from climbing the ；stairs ；.爬楼梯使她上气不接下气的。

She stole down the ；stairs ；and passage again .于是她重新悄悄走下阶梯和通道。