1. Stalactites and stalagmites are types of speleothems found in caves.
钟乳石和石笋是洞穴中发现的不同类型的洞穴沉积物。
2. The formation of speleothems can take hundreds or even thousands of years.
洞穴沉积物的形成可能需要数百甚至数千年的时间。
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