我的教室在三楼。
突然，整个大楼开始摇晃，我非常害怕- - - - - -我们的教室在三楼，如果大楼垮塌，我们将必死无疑。
Suddenly, the whole building started to shake. I was scared — my classroom was on the third floor, the building would collapse and we would die there.
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.
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