吃透英语课本，提升在校竞争力
n. 楼层
复数：storeys
A staircase leads to the upper storey.
有一段楼梯通往上面一层。
A staircase leads to the upper storey .
...long brick buildings, two storeys high.
…很长的两层砖楼。
n.[建]楼层；叠架的一层
floor
