谨奉告，图书馆在二楼。
For your information (ie This is sth you may wish to know), the library is on the first floor.
咱们在二楼烤肉餐室见面。
Let's meet in the first-floor grill-room.
他的住处是那家店铺二楼上的两个小房间。
His living quarters were two small rooms on the second floor of the store.
