磁铁

例句：

1. 1.The magnet attracts iron filings to its north pole.
   磁铁吸引铁屑到其北极。
2. 2.Magnetic fields can be used to detect hidden objects.
   磁场可以用来探测隐藏的物品。
3. 3.The scientist discovered a new type of magnet that could be used for medical purposes.
   科学家发现了一种新类型的磁铁，可以用于医疗用途。