strange formations are exposed in the naked rock. 裸露的岩石显露出奇特的造型
the basis of Lechuguilla's remarkable formations. 它们最终形成了龙舌兰洞的奇景
they came across whole galleries filled with the most unusual formations, 他们发现了成片叹为观止的地貌
They were about to discover some of the most exquisite formations ever seen underground. 因为他们发现了一些 地底世界中最精美的构造
These strange stalactite-like formations are known, rather appropriately, as snotites, 这些奇特的钟乳石状的结构 确切地说 叫做“鼻涕石”
But sometimes the formations in a cave stop growing altogether. 但有时洞穴内的这些活动会完全停止