Traditional: 層
层 (céng) means “to pile on top of one another; layer; stratum; floor (of a building); story; (math.) sheaf; classifier for layers”. It is an HSK 3 Chinese character (traditional 層) in the HSK 3.0 vocabulary.
我住在三楼。
Wǒ zhù zài sān lóu.
I live on the third floor.
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