Our first explosion used up the available oxygen in the combustion chamber and it needs to be refreshed.

我们的第一次爆炸中使用了燃烧室提供氧气，它需要被刷新。

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The excavation of upper chamber was conducted by the methods of bench excavating in layers and common explosion.

上室开挖采用分层梯段开挖和普通爆破方法。

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Vacuum chamber; Explosion-suppression performance; Explosion parameter; Importance; Analytic hierarchy process;

真空腔； 抑爆性能； 爆炸参数； 重要度； 层次分析法；

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