极少量镝就能让发电机里的磁铁重量减轻90%。而铽能让照明灯节能80%。

Tiny quantities of dysprosium can make magnets in electric motors lighter by 90 percent, while terbium can help cut the electricity usage of lights by 80 percent.

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当然，磁铁的承重是有限的，“月球漫步者”跑鞋最大可承载183公斤的重量。

Of course, there's a limit to how much weight the magnets can withstand and in the case of MoonWalkers that limit is 183 kilograms.

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