垮落线与煤层走向是一定角度。
There is a certain angle between caving line and coal seam strike.
建筑物倒塌时，人们通常被挤压在垮落的建筑残骸中。
When buildings collapse, people are frequently pinned under falling debris.
松散载荷层滞后垮落，形成第二次冲击载荷，三个过程间隔时间很短；
Third, granular-mass loading stratum descended after a while , which brought second impact load, the interval among the three courses was short.
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