- 岩洞: grotto; abra; abri
- 陷落: subside; sink in; cave in
- 井: well
- 岩洞: [地] grotto; abra; abri
- 陷落: 1.(下陷沉降) subside; sink in; cave in 地壳的陷落 subsidence of the earth's crust2.(沦陷) fall into enemy's hands 一枪未发堡垒就陷落敌手。 the fort fell into the enemy's hands without a shot being fired.3.(落在不利的境地) sink [fall] into; land oneself in; [地质学] foundering; depression
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