为什么每几十万年，磁场磁极就会自我颠倒一下呢？
Why does the field spontaneously reverse itself every few hundred thousand years?
打个比方，这个“磁极矩”可以让电子像一个微型的条形磁铁那样在磁场中旋转。
They act, in other words, like tiny bar magnets with north and south poles, making them rotate in a magnetic field.
磁场产生于地球快速旋转的中心，并产生发电。” 而且磁极与地球的物理两级并不在一条直线上。
The field is generated in the Earth’s core as it spins, creating a dynamo," and the magnetic poles don’t line up with the Earth’s physical poles.
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