The magnet creates a field that changes the polarity of a tiny, tiny portion of the metal particles which coat each platter's surface.
这个磁体创建一个磁场,能改变覆盖在磁盘表面的小金属粒子的极性。
2
In motor racing, for instance, if a driver is taken to hospital after a crash the metal in the capsule would prevent the use of an MRI scanner, which is essentially a powerful magnet.