He was afraid that the sky might collapse, the land might cave in and he would have no place to live.
他害怕天会塌下来，地会陷下去，自己会没有地方生存，急得饭也吃不下，觉也睡不好。
Devastating effects on the road embankment stability and deformation were concerned because of the karster cave collapse resulting in obvious ground deformation.
溶洞坍塌之后造成的地表变形和移动对路基的稳定性影响较大，必须对溶洞进行工程处理。
The geological disaster, such as cave of karst, rushing water and collapse often occur in tunnel excavation.
隧道在施工中不可避免地会遇到诸如溶洞、突水、坍塌等常见的地质灾害。
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