Third, granular-mass loading stratum descended after a while , which brought second impact load, the interval among the three courses was short.
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.
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；
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