HSK 7-9
开采
kāicǎi动
to extract (ore or other resource from a mine); to exploit; to mine
这里禁止随意开采地下资源。
Zhè lǐ jìn zhǐ suí yì kāi cǎi dì xià zī yuán.
Unauthorized extraction of underground resources is prohibited here.
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Appears across levels (7-9) in the HSK 3.0 word list.