It was a five-story building, and their flat was on the third floor.

这是一幢五层楼的建筑，他们的房间是在三楼。

youdao

We are rabbits. We have a new flat. It's on the third floor.

我们是兔子。我们有一间新的公寓。它在三楼。

youdao

The flat is on the third floor with 3 rooms. One is bedroom, the other two are bathroom and kitchen.

公寓在三楼有三个房间，一个是卧室另两个是洗手间和厨房。

youdao

When not in use, the power-operated third row folds down at the push of a button to create a flat cargo floor.

FORBES: 2014 Land Rover Range Rover Sport, A True Decathlete