洞穴 Cave
（重定向自Dripstone cave）
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洞穴（洞、洞窟）是指地底的信道或空间，可进入其中，形成方式可能是水的侵蚀作用，或是风与微生物等其他外力的风化作用，许多自然界的洞穴是形成于石灰岩地带，为溶洞（钟乳洞），另有一种相似的地形，称为石棚。
Dripstone cave
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英语百科
Cave 洞穴
（重定向自Dripstone cave）
A cave or cavern is a hollow place in the ground, specifically a natural underground space large enough for a human to enter. Caves form naturally by the weathering of rock and often extend deep underground. The word cave can also refer to much smaller openings such as sea caves, rock shelters, and grottos.
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