1 N-COUNT 二楼;二层 The
first floor of a building is the floor immediately above the one at ground level.
二楼;二层 [British] [US] in AM, use 美国英语用 second floor
2 N-COUNT 一楼;底层 The
first floor of a building is the one at ground level.
一楼;底层 [US] in BRIT, use 英国英语用 ground floor
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