cavern
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.
地下洞穴是在过去水流过的地方形成的。
词源late 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.