Don't choose the first or second floor.
别去一楼二楼。
I live on the second floor, and he lives on the first floor.
我住在二层，他住在一层。
First, they visited our classroom on the second floor at two fifteen.
首先他们在两点十五分参观我们的教室。
By the time I bring her down from the first floor, the second wave has struck.
我将她从二层带到一层时，第二个浪就袭来了。
Our room is on the first floor and yours (theirs) on the second.
我们的房间在一楼，你们的(他们的)在二楼。
Our room is on the first floor and there is on the second.
我们的房间在一楼，他们的房间在二楼。
Our room is on the first floor and there is on the second.
我们的房间在一楼，他们的房间在二楼。
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