在美国西部的变化自去年在地磁场逆转。
Variations in geomagnetic field in western US since last reversal.
加州大学的地质年代学家们发现，戈纳石器正是在标志更新世开端的那次磁场逆转发生之前制造的。
Geochronologists at the University of California found that the stone tools from Gona were made just before the magnetic field shift which began the Matayama epoch.
你可以逆转磁场吗？
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