1、二楼用英语是second floor。second floor读音：英[ˈsekənd flɔː(r)]，美[ˈsekənd flɔːr]。

2、We have a big library on the second floor.我们有一个大图书馆在二楼。

3、And some audiences were invited to the second floor.一些观众被邀请到二楼。