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。
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.
搜救人员希望四名矿工可以到达建在矿中的救生室，但营救他们仍需往下打钻1000多尺。
Rescuers hope that the miners may have found their way to rescue Chambers built into the mine, but reaching them requires drilling down 1,000 feet.
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。
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.
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