hammer magnet

例句：

1. 1. The magnet attracts iron filings to it.
   磁铁吸引铁屑。
2. 2. The magnet is used in many industrial applications.
   磁铁在许多工业应用中都有使用。
3. 3. The magnet is a powerful tool for scientists and engineers.
   磁铁是科学家和工程师的有力工具。