- produce an infinite variety of forms, but all are created by the same process -
造就了千姿百态的溶洞地形 但它们的形成过程都是一样的 - the slow deposition of dissolved limestone.
都是由水溶碳酸钙缓慢沉淀而来 - And when stalactite meets stalagmite
钟乳石与石笋相遇后 - a column is born.
便形成了石柱 - Structures like these in North America's Carlsbad Cavern
北美洲卡尔斯巴德溶洞中的这些构造 - can take many thousands of years to develop.
经历了数千年的形成过程 - 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
a column is born. 便形成了石柱
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