HSK 5
上下
shàngxià名
the top and bottom of sth; the full vertical extent of sth; from top to bottom; to go up and down; before and after (as in 上下文 "context")
这座楼上下共有二十层。
Zhè zuò lóu shàng xià gòng yǒu èr shí céng.
This building has twenty floors from top to bottom.
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New in the HSK 3.0 word list at level 5.