geomagnetic shell

例句：

1. 1. The geomagnetic shell is the outermost layer of the Earth's magnetic field.
   地磁壳层是地球磁场的最外层。
2. 2.The geomagnetic shell plays a crucial role in determining the Earth's magnetic field.
   地磁壳层在确定地球磁场方面起着至关重要的作用。
3. 3.The geomagnetic shell is responsible for shielding the Earth from harmful radiation.
   地磁壳层负责保护地球免受有害辐射的侵害。