假如地球磁极逆转而造成生物大量灭尽，那就不难表明为何每隔一段时间，使地球文明周期性的毁灭。
If the Earth's magnetic pole reversal caused by biological extinction, it is not difficult to explain why from time to time, so that the periodic destruction of the Earth civilization.
整个地球史上磁极逆转不时发生。
Our planet's magnetic field has reversed polarity from time to time throughout its history.
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