以下为句子列表：
英文: For starters, the core's motion could help explain why magnetic north and south periodically wander or reverse over Earth's history.
中文: 就像起动器一样，地核的运动有助于解释南北磁极周期性变换或历史上地球磁极的翻转原因。
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英文: In 1988, at the age of 50, she became the first woman to travel alone to the magnetic North Pole .
中文: 一九八八年，她以五十岁之龄，成为全球第一位只身走访磁北极的女性。
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英文: The magnetic North and South poles have shifted before in the course of the planet's history - one result being the last Ice Age.
中文: 在地球的历史进程中地磁北极和磁南极已经转换过-一种结果就是最后的冰河时期。
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英文: Through paleomagnetism, (the study of the magnetic properties of rocks), scientists now have solid proof that the earth's magnetic field, and thus the geomagnetic north and south poles, have reversed itself namy times in the past.
中文: 通过古磁学（岩石磁特性研究），科学家现在拥有地球磁场一致证据，因而地磁北极和南极，在过去已经翻转多次。
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