- They discovered that Lechuguilla's limestone had actually been eaten away by sulphuric acid,
他们发现龙舌兰洞的石灰岩 实际上是被硫酸侵蚀的 - cutting through literally miles of limestone.
凿穿了差不多数英里的石灰岩 - And when sulphuric acid dissolves limestone
硫酸在溶解石灰岩的同时 - it leaves behind gypsum,
也留下了石膏 - the basis of Lechuguilla's remarkable formations.
它们最终形成了龙舌兰洞的奇景 - And there was one set,
这里有一组景观 - more than a mile from the surface,
位于地表之下1英里多的地方
it leaves behind gypsum, 也留下了石膏
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