cav·ern
noun/ˈkævən/
/ˈkævərn/
- a cave, especially a large one
大洞穴；大山洞 - The underground cavern was formed where water used to flow.
地下洞穴是水曾经流动的地方形成的。
Word Originlate Middle English: from Old French caverne or from Latin caverna, from cavus ‘hollow’. Compare with cave. - The underground cavern was formed where water used to flow.