维苏威火山的喷发十分剧烈，持续两天。炽热气体和火山灰混合在一起，形成了一种被称为火山碎屑流的罕见灾害。
The eruption of Vesuvius was intense and strong , lasting for two days and forming a relatively rare , but inescapable flow of super-heated gas and ash known as a pyroclastic flow .
火山碎屑流灾害