HSK 7-9
洞穴
dòngxué名
cave; cavern
探险队进入了山中洞穴。
Tàn xiǎn duì jìn rù le shān zhōng dòng xué.
The exploration team entered a cave in the mountain.
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Appears across levels (7-9) in the HSK 3.0 word list.