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.
三是“第三次浪潮”所覆盖的人口约千万，他们生活在信息时代。
Third, ' the third tide', which refers to the population approximately surely, they live in the information age.
三是“第三次浪潮”所覆盖的人口约千万，他们生活在信息时代。
Third, ' the third tide', which refers to the population approximately surely, they live in the information age.
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