英语语法分析

The holocrystalline porphyritic olivine basalts and pyroclastic rocks are the components of Pleistocene to recent volcanic activities.

完整的斑状斑状橄榄石玄武岩和火山碎屑岩是最近火山活动的更新世的组成部分。

Killing mechanism: ash, pyroclastic flows.

杀伤机制：火山灰、火山碎屑流。

Pyroclastic flows are some of the most fearsome hazards posed by erupting volcanoes.

火山碎屑流是由火山喷发而引起的最可怕自然灾害。