n. cavern
adj. subterranean
数百年来，这尊雕像被深埋于一个地下洞穴中。
For hundreds of years the statue had remained buried in an underground cavern.
这其中面临的一个障碍是：要寻找到大空间以及可用的地下洞穴。
One of the obstacles: finding big, usable, underground caverns.
如果石油是指廉价地采自地下洞穴的传统能源，那么“石油峰值”会很快到来。
"Peak oil", if oil means the traditional sort that comes cheaply out of holes in the ground, probably will arrive soon.
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