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.
有四间卧室在二楼，第五间在三楼。
Four bedrooms are on the second floor, while the fifth is on the third floor.
在二楼和三楼的房间里，你可以学习一些关于通信、环境、数学、物理、化学等方面的知识。
In its rooms on the second and third floors, you can learn some knowledge about communications, the environment, maths, physics, chemistry and so on.
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