磁石

例句：

1. 1. The magnet attracts iron filings to it.
   磁铁吸引铁屑。
2. 2. The magnet is strong enough to hold a small coin.
   这个磁铁足够强可以吸住一枚硬币。
3. 3.The magnet was used in the ancient navigation system.
   磁铁在古代导航系统中被使用。