In early April, 29 coal miners were lost after an accident at West Virginia's Upper Big Branch mine in the worst U.S. mining disaster in four decades.
4月，美国发生40年来最严重的矿难事故，29名矿工在西佛吉尼亚州矿难中丧生。
A similar type of explosion occurred in the 2006 Sago mining disaster, which left 12 miners dead after trapping them underground for nearly two days.
2006年萨戈(Sago)矿难也是类似的爆炸引发的，那次矿难将矿工们困在地下两天后，造成12名矿工死亡。
As the depth of mining and horizontal extents increasing, rock-burst becomes the main cause of mining disaster.
随着平均开采深度和水平开采范围的增大，岩爆逐步地成为矿井地质灾害的主要起因。
As the depth of mining and horizontal extents increasing, rock-burst becomes the main cause of mining disaster.
随着平均开采深度和水平开采范围的增大，岩爆逐步地成为矿井地质灾害的主要起因。
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