我睡在三楼。
I sleep on the third floor
闲置的.卧室在三楼。
The spare bedroom is on the second floor
他从三楼的窗户跳了下来。
He jumped out of a third-storey window.
电梯在一、二、三楼不停。
The elevator doesn't stop at floors 1, 2 and 3.
一位男子在三楼的窗户朝楼下大声喊道：“别碰那姑娘！”
From a window on the third floor, a man called down," let that girl alone!"
B在二楼或者三楼。我记不太清楚了，但是你很容易就能找到。
It's on the second or third floor. I can't remember exactly, but you'll find it easily.
这是在walker三楼的体育馆。
That is the gymnasium on the third floor of Walker.