第一和第三次的爆发的火山灰覆盖了大部分北美州。
Both the first and third eruptions covered most of North America with ash.
第三，有一次撞击又碰巧发生在火山活跃的地区。
Third, one of them just happened to strike where these volcanoes were active.
这是我第一次见到真正的活火山。
过去三百年里该地区发生了三次大的火山喷发。
The area has had three major eruptions in the last three million years.
在第一次火山爆发的时候，荒岛上已经死了许多野兽。
A large number of the animals of the island had perished in the first eruption.
在第一次火山爆发的时候，荒岛上已经死了许多野兽。
A large number of the animals of the island had perished in the first eruption.
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