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。
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.
天坑是含二氧化碳的岩石在化学溶解作用下自然形成的，有些情况则是因为煤矿坍塌而生成。
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