storey       
noun [ C ] UK (US story) uk/ˈstɔː.ri/ us/ˈstɔːr.i/
B2 楼层,层
a level of a building
  a three-storey house 3层高的房子 
 Their new house has four storeys including the attic. 他们的新房子包括阁楼一共有4层。 
 - More examples
 - The proposed new office tower is a steel and glass structure 43 storeys high.
 - My bedroom is on the third storey.
 - Most of the houses in this street have three or four storeys.
 - She jumped from the third storey of the house to escape the fire.
 - At the turn of the century, Congress placed a height restriction of 13 storeys on all buildings in Washington.