磁子

例句：

1. 1. The magnet attracts iron filings to its north pole.
   磁铁吸引铁屑向其北极。
2. 2. Magnetic fields are used in navigation systems.
   磁场用于导航系统。
3. 3. Magnetic resonance imaging (MRI) is a medical test that uses strong magnetic fields and radio waves to create images of thebody's tissues.
   磁共振成像是一种医疗测试，使用强磁场和无线电波来创建身体组织的图片。