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N-PLURAL
樓梯
Stairs are a set of steps inside a building which go from one floor to another.
例句
Nancy began to climb the stairs...
南希開始爬樓梯。
We walked up a flight of stairs...
我們上了一段樓梯。
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N-SING
一層樓梯;一段樓梯
A stair is a flight of stairs.
例句
I followed her down the stair.
我跟著她下了樓梯。
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N-COUNT
一級樓梯
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級樓梯上。