More than 70 miners were killed in the initial blast.

在最初的爆炸中，有70多名矿工遇难。

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Caused by initial blast (damage), prolonged exposure to fire.

由初始爆破(损坏)引起，长时间曝光引起火灾。

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Caused by initial blast (damage), prolonged exposure to fire.

由初始爆破(损坏)引起，长时间曝光引起火灾。

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