dipole source

例句：

1. 1.The dipole source is responsible for the magnetic field in a region.
   偶极源负责一个区域的磁场。
2. 2. The dipole source is a fundamental concept in magnetism.
   偶极源是磁学中的一个基本概念。
3. 3. The dipole source is used to calculate the strength of an electric field.
   偶极源用于计算电场的强度。