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 yours (theirs) on the second.
我们的房间在一楼，他们的房间在二楼。
卫兵队长制服在一楼使用，中尉制服在二楼和三楼使用效果更好。
The Chief guard uniform works well on the first floor, while the lieutenant uniforms work better for the second and third floors.
我们可以在美术教室画画在一楼和阅读故事书在图书馆在二楼。
We can draw pictures in the art room on the first floor and read story-books in the library on the second floor.
我们可以在一楼的美术室画画，在图书馆的二楼阅读故事书。
We can draw pictures in the art room on the first floor and read story-books in the library on the second floor.
我们可以在一楼的美术室画画，在图书馆的二楼阅读故事书。
We can draw pictures in the art room on the first floor and read story-books in the library on the second floor.
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