吸铁石

例句：

1. 1. The magnet attracts iron filings to it.
   磁铁吸引铁屑。
2. 2. He used a magnet to remove the screw from the board.
   他用磁铁把螺丝从木板上取下来。
3. 3. The scientist discovered that magnets can be used to control robots.
   科学家发现磁铁可以用来控制机器人。