volcanic projection

• 火山喷发物

volcanic projection的用法和样例：

例句

1. The eruption had coincided with the annual Typhoons that regularly lash the Islands.Heavy rainfall drummed on the hot and loosely packed volcanic debris.
   这次爆发碰巧是在年度台风期，大雨浇在松散堆积的高温喷发物上。