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When a volcano explosion is about to happen, that steam becomes more active, then disappears completely during the explosion because there's no more pressure coming from inside the earth to push the steam through the cracks in the earth.
当火山快要爆发时，蒸汽就会变得活跃，在火山爆发期间就会完全消失，因为在地壳内部没有更多的压力推动蒸汽。