磁极

例句：

1. 1. The magnet attracts iron filings to it.
   磁铁吸引铁屑。
2. 2. The scientist used a magnet to align the gears.
   科学家用磁铁来对齿轮进行对齐。
3. 3. The magnetized metal strip was used as a key.
   被磁化的金属条被用作钥匙。