focusing magnet

• 聚焦磁铁,聚焦磁石,聚焦磁体

focusing magnet的用法和样例：

例句

1. A magnet attracts iron and steel.
   磁石吸钢铁。
2. If a magnet loses its magnetism it will no longer attract things.
   磁石如果失去磁力，就不能再吸东西了。