Experts on site suspected that the sudden collapse of an underground karst cave created by eroded limestone caused the sinkhole, but the investigation is ongoing.
勘察了现场的砖家怀疑石灰岩被腐蚀，导致地下的喀斯特溶洞突然坍塌，从而形成了天坑，但调查还在进行中。
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Sinkholes are formed by the chemical dissolution of carbonated rocks and are usually naturally occurring with a few instances of a sinkhole being formed by the collapse of a mine.