最初，这一理论认为2003年5月降爆发大灾难，结果什么都没发生，他们就把日期推迟到2012年冬至，与古玛雅历法中的循环结束相符。
Initial theories set the disaster for May 2003, but when nothing happened the date was moved forward to the winter solstice in 2012, to coincide with the end of a cycle of the ancient Mayan calendar.
某些理论家以全球大灾难这个虚构的概念，来解释地球的地质记录显示物种突然灭绝的事件，此一事件和达尔文的例子有何关联？
What is its relevance to the notion that global cataclysms have been imagined by some theorists to explain the sudden extinction of species that is revealed in the geological record of the planet?
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