夹层 /jiācéng meaning in English

mezzanine [mezzanines]▼(intermediate floor or storey in between the main floors of a building; specifically, one that is directly above the ground floor which does not extend over the whole floorspace of the building)
noun
[UK: ˈme.zə.niːn] [US: ˈme.zə.ˌnin]