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N-PLURAL
楼梯
Stairs are a set of steps inside a building which go from one floor to another.
例句
Nancy began to climb the stairs...
南希开始爬楼梯。
We walked up a flight of stairs...
我们上了一段楼梯。
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N-SING
一层楼梯;一段楼梯
A stair is a flight of stairs.
例句
I followed her down the stair.
我跟着她下了楼梯。
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N-COUNT
一级楼梯
A stair is one of the steps in a flight of stairs.
例句
Terry was sitting on the bottom stair.
特里正坐在最下面的一级楼梯上。