There is a fire exit on each floor of the building.

这栋建筑每层楼都有个消防通道。

《牛津词典》

You may choose any item from a particular floor, or may choose to go up to the next floor, but you CANNOT go back down except to exit the building.

你可以在任何一层选择任意商品，你也可以选择登上下一层，但是，你不能往回走，除非你要离开商店。

youdao

Exit immediately at your floor. Do not wait for others behind you.

到达楼层立即出电梯，不要等待身后的人。

youdao

Today one can still descend to the vaulted cellar and inspect two wooden panels one holding glasses behind a well-stocked bar that may be unlocked with a small key and pivoted from floor to ceiling to permit a discreet exit.

ECONOMIST: The caf�� at the heart of revolutionary Cairo

But even while Mr Purcell remains, a floor under the share price is being provided by speculation that he will arrange a face-saving exit for himself by selling the bank.

ECONOMIST: Face value: Last stand at Morgan Stanley | The