Why does the field spontaneously reverse itself every few hundred thousand years?
为什么每几十万年，磁场磁极就会自我颠倒一下呢？
Reverse logistics is becoming a specially important research field in the world.
反向物流已经逐渐成为世界上一个很重要的研究领域。
Reverse logistics is a new research field in recent years.
逆向物流是近些年新兴的研究领域。
Can you make the magnetic field reverse?
你可以逆转磁场吗？
Can you make the magnetic field reverse?
你可以逆转磁场吗？
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