这张X射线的照片展示了爆炸后产生的气体膨胀的外壳。
The X-ray image shows an expanding shell of hot gas produced by the explosion.
研究结果表明，管内瓦斯爆炸过程中所产生的爆炸波有两个峰值，第一峰值为爆炸波压力，第二峰值压力为火焰到达后加热气体升压所致。
The result shows that there are two peak values, the first one is explosion wave pressure; the second is caused by the hot gas, which is heated by the subsequent flame.
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