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我们居住的地球好象地芯有一根巨大的磁棒,其N极和S极分别在地球南、北极附近.关于地磁场的起源,众说纷纭.虽然地球的磁性与高空中围绕地
The earth we live in seems to have a giant magnetic bar, with its N- and S-poles nearby the Earth’s south and north poles. There are many opinions about the origin of the Earth’s magnetic field. Although the Earth’s magnetism and high altitude