第二层英语怎么说

第一层 the ground floor

第二层 the second floor

第三层 the third floor

He barked and ran up to the second floor.

他吠叫着跑向二楼。

On the second floor there is Human and Nature room ．

在二楼有“人与自然”房间。

How many stairs are there up to the second floor?

上到第三层一共有多少磴楼梯？