rare earth-cobalt permanent magnet

例句：

1. 1. The rareearth permanent magnets are used in manyelectronic devices.
   这些稀土永磁体被用于许多电子设备中。
2. 2. The new design of thecar uses rare earth permanent magnets toimprove its performance.
   这款新车的设计使用了稀土永磁体来提高其性能。
3. 3. The rareearth permanent magnets are essential for themanufacturing of electric motors.
   稀土永磁体是制造电动机所必需的。