who knows how many Lechuguillas are still waiting to be discovered? 谁知道还会有多少个龙舌兰洞 等着人们去发现呢
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