以下为句子列表：
英文: A major discovery unfolded over the past five years as it became possible for scientists to compare accurate maps of the geomagnetic field taken 20 years apart.
中文: 过去五年里，由于科学家终于能够比对相隔20年所观测到地球磁场的准确分布，因而有了重大发现。
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英文: Satellites are providing clear snapshots of the geomagnetic field at the earth's surface, while new strategies for simulating earthlike dynamos on supercomputers and creating physical models in the laboratory are elucidating those orbital observations.
中文: 人造卫星能清楚拍摄地表磁场的图像；而利用超级电脑来模拟地球发电机，以及在实验室里建立的物理模型，则解释了轨道上的观测结果。
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英文: The magnetic leakage field distribution above linear defects of a tube sample under the geomagnetic field was modeled according to magnetic dipole theory.
中文: 摘要利用磁偶极子理论，建立稳恒微弱地磁场作用下管类试件线状缺陷段产生的漏磁场模型。
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英文: The theoretical analysis and experiment outcome indicate that geomagnetic field and testing environment have momentous effect on testing outcome, that specimen should be laid transmeridionally as soon as possible while testing and that the swing value and
中文: 理论分析和实验结果表明：地磁场和检测环境对检测结果会产生较大影响，检测时应尽可能将试件东西方向放置；疲劳试件断裂前后的磁记忆信号的幅值和过“0”线将发生变化。
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英文: Thereby it can be deduced that the vector character and latitude effect of the geomagnetic field exert little influence upon the applicability and reliability of metal magnetic memory testing and diagnostic technique.
中文: 从而推知：地磁场的矢量特性和纬度效应对金属磁记忆检测与诊断技术适用性和可靠性的影响都不大。
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