At this point, the natural demise of Luanping County.
至此，滦宁县自然消亡。
The author deeply studied cooling unit of pyroclastic flow 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。
The author deeply studied cooling unit of pyroclastic flow 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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