... magnetic-core switch 磁心开关 magnetic-core switching time 磁心开关时间 magnetic-matrix switch 磁模开关；磁膜开关；磁性矩阵开关；磁阵开关 ...
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magnetic core switching time 磁心开关时间
The periodic switching of the magnetic north and south poles of the Earth throughout time, probably as a result of movement of fluid within the Earth's core.
地球的地磁北极和南极随时间作周期性的变换，或许是地核内部流体运动的结果。
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