earth rs magnetism

• 地磁

earth rs magnetism的用法和样例：

例句

1. This book is about the earth's magnetism.
   这本书是有关于地磁的。
2. Data on the Earth's ancient magnetic field are available from archeomagnetic and paleomagnetic measurements.
   有关地球古磁场的数据是通过古地磁粗额测量而得来的。