Iron is by far the best metal for making magnets.

铁是制造磁体的最佳金属。

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The main bottleneck, they argue, could be the production of rare earth metals such as neodymium, which is often used in making magnets.

他们争论的主要难题是，稀土金属如钕的生产通常用来制作磁铁。

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They act, in other words, like tiny bar magnets with north and south poles, making them rotate in a magnetic field.

打个比方，这个“磁极矩”可以让电子像一个微型的条形磁铁那样在磁场中旋转。

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