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.
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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