要做火焰,而不是扑火的飞蛾。
要做火焰,而不是扑火的飞蛾。
这是一上钕磁铁,它磁性很强,现在在火焰炙烤后它没有磁性了,想要做磁铁,你先得找到一些磁性的原子。
This is a neodymium magnet-it's pretty darn strong. And now, after heating it in a flame... it's no longer magnetic. Well, to build a magnet, all you need to do is find a bunch of magnetic atoms.
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