我的教室在三楼。
我们的教室在二楼，他们的在三楼。
Our classroom is on the second floor, and theirs is on the third floor.
我们的教室在二楼，他们的在三楼。
Our classroom is on the second floor, and theirs, on the third floor.
我们的教室在二楼，他们的在三楼。
Our classroom is on the second floor, and theirs, on the third floor.
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