snap magnet

例句：

1. 1. This magnet attracts iron to it.
   这个磁铁能吸引铁。
2. 2. The magnet is strong enough to hold the paper together.
   这个磁铁足够强，能把纸粘在一起。
3. 3. Magnetic fields are used in many scientific experiments.
   磁场在许多科学实验中被使用。