橙色和蓝色的线条分别表示地球磁场中南极、北极两种相反磁性的磁力线。
The orange and blue lines depict the opposite north and south polarity of Earth's field lines.
磁力梯度张量表示的是磁场矢量三个分量的空间变化率，能够很好地用于偶极子场源的定位跟踪。
Magnetic gradient tensor is that the three components of the magnetic field vector space rate of change, is able to do well for the dipole localization and tracking.
线的密度表示磁场的强度，磁场强的地方磁力线就密集。
The density of the lines indicates the magnitude of the field, the lines Being crowded together where the magnetic field is strong.
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