He was afraid that the sky might collapse, the land might cavein 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。
2
Devastating effects on the road embankment stability and deformation were concerned because of the karster cavecollapse 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。
3
The geological disaster, such as cave of karst, rushing water and collapse often occur in tunnel excavation.