On clear winter nights, the ground and overlying air cool off rapidly, especially at high elevations.
在冬季晴朗的夜晚，地面和上方的空气迅速冷却，在高海拔地区更加明显。
The existence of overlying shallow karst is very harmful to the stability and safety of ground and building.
覆盖型浅埋岩溶的存在，给地基的稳定及建筑物的安全造成很大的威胁。
During overlying rock strata being fractured, the surface gas drainage boreholes may be damaged due to ground movement.
在长壁工作面通过的过程中，地面垂直钻孔可能随岩层移动而发生破坏。
During overlying rock strata being fractured, the surface gas drainage boreholes may be damaged due to ground movement.
在长壁工作面通过的过程中，地面垂直钻孔可能随岩层移动而发生破坏。
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