在幕式构造作用下，滦平盆地经历了5期火山喷发和构造沉降演化阶段。
This basin underwent 5 evolution stages including volcanic irruptions and tectonic subsidences under the actions of episode tectonic movements.
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。
The author deeply studied cooling unit of pyroclastic flow in Luanping area and divided the volcanic rock into 12 cooling units.
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