HSK 7-9
孔
kǒng名
hole; classifier for cave dwellings; surname Kong
木板中间钻了三个小孔。
Mù bǎn zhōng jiān zuān le sān gè xiǎo kǒng.
Three small holes were drilled in the middle of the board.
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Appears across levels (7-9) in the HSK 3.0 word list.