- (British English)
the level of a building above the ground level Topics Houses and homesa2, Buildingsa2底层以上的一层;二楼 - (North American English) (British English ground floor)
the floor of a building that is at the same level as the ground outside Topics Houses and homesa2, Buildingsa2底层,底楼,一楼(建筑物与外面地面相平的一层)