catastrophic explosion造句

• If a new round of small , precursor eruptions begins in yellowstone ? and they usually do so weeks to hundreds of years before a catastrophic explosion ? testing the oxygen fingerprint of those lavas and the ages of their zircons should reveal what type of magma is abundant in the chamber below
  如果黄石国家公园开始产生新一波前兆性质的小型喷发（通常是在灾难性爆发的前几周甚至数百年前） ，这时测试熔岩中含氧的特徵以及锆石的年龄，应该就可以了解下方岩浆库富含何种型态的岩浆。