One can raedily trace the disappearance of dinosaurs to a major cataclysmic event.
人们很容难把恐龙长逝的缘由归结为宽酷的灾难性事件。
About 4.4 billion years ago, a Mars-sized planet crashed into Earth. This cataclysmic event actually made Earth melt, and the fallout from the collision became the Moon.
大约44亿年之前，地球被一个有火星大小的行星撞击，撞击的后果一个是地球融化，另外一个就是月亮的形成。
Beyond this, his book, though very readable, does not add greatly to our understanding of the cataclysmic event that set the first half of the 20th century on its disastrous course.
除此之外，他的书虽然值得一读，但是并没有大大增加我们对于这个把20世纪上半叶推向灾难的剧变事件的理解。
Some of the ammonium, or NH4+, ions generated during subsequent reactions fall back to Earth in snow and are preserved in ice cores, where they linger as signs of the cataclysmic event.
一些在后来的反应中形成铵离子，通过下雪回到地球被保存在冰核中，成为发现这巨大事件的证据。
Some of the ammonium, or NH4+, ions generated during subsequent reactions fall back to Earth in snow and are preserved in ice cores, where they linger as signs of the cataclysmic event.
一些在后来的反应中形成铵离子，通过下雪回到地球被保存在冰核中，成为发现这巨大事件的证据。
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