geomagnetic boundary

例句：

1. 1.The geomagnetic boundary is a critical factor in determining the location of magnetic poles.
   地磁边界是确定磁极位置的关键因素。
2. 2.The research on the geomagnetic boundary has significant implications for understanding the Earth's magnetic field.
   对地磁边界的研究对于理解地球磁场具有重要意义。
3. 3. The geomagnetic boundary plays a crucial role in regulating the Earth's magnetic field.
   地磁边界在调节地球磁场中起着关键作用。