这次生物大灭绝事件的发生似乎至少部分是因为大量的火山喷发，火山喷发将大量的二氧化碳喷到大气中。
At least part of the cause of this extinction seems to have been huge volcanic eruptions that poured carbon dioxide into the atmosphere.
一方面，火山喷发是一种自然灾害，它不仅对人类产生直接危害，而且还会诱发次生灾害或对人类的生存环境造成长期的危害。
The volcanic eruption is one of the natural hazards. Volcanic eruption not only endangers human being but also induce some secondary or longterm hazards.
一方面，火山喷发是一种自然灾害，它不仅对人类产生直接危害，而且还会诱发次生灾害或对人类的生存环境造成长期的危害。
The volcanic eruption is one of the natural hazards. Volcanic eruption not only endangers human being but also induce some secondary or longterm hazards.
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