Karst collapse is the most prominent geological hazard in covered karst area.
岩溶塌陷是覆盖型岩溶区最突出的地质灾害问题。
Facts have revealed that vacuum suction is a natural physical phenomenon in covered Karst areas.
许多事实证明，真空吸蚀作用是覆盖型岩溶地区一种自然物理作用。
The covered karst is the great important engineering geologic problem recently discovered in Three Gorge Reservoir region.
三峡库区隐伏岩溶问题是近期发现的重大工程地质问题。
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