The author deeply studied cooling unit of pyroclasticflow in Luanping area and divided the volcanic rock into 12 cooling units.
笔者对滦平地区火山碎屑流冷却单元进行了深入的研究,划分出12个冷却单元。
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The eruption seems to have started with the volcano spitting out lumps of rock up to 2 metres across, before releasing an enormous pyroclasticflow - a fast-moving gush of hot gas and rock.