在第几层楼用英语怎么说啊?

英订海斥剿俪济筹汐船搂式英语：the ground floor, the first floor, the second floor.
美式英语：the first floor, the second floor, the third floor.等等。

on the first floor,在第一层楼，以此类推

On the first/secend/third…… floor