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What Makes a Magnet Stick to Some Metals but Not Others
磁铁为什么只吸某些金属而不吸其他金属
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Magnets attract iron, nickel, and cobalt most strongly.磁铁对铁、镍和钴的吸引力最强。
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These metals have tiny magnetic parts that line up easily.这些金属内部有微小的磁性单元，容易整齐排列。
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Aluminum, copper, and gold do not respond to magnets.铝、铜和金不会被磁铁吸引。
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Their atoms resist magnetic alignment and stay neutral.它们的原子抗拒磁化，保持中性。
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You can test objects with a small fridge magnet at home.你可以在家拿一个小冰箱贴测试物体。
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Magnetic force works without touching—this is called a field.磁力无需接触即可作用，这称为磁场。
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Trains use powerful magnets to float and move smoothly.列车利用强磁力悬浮并平稳运行。
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Understanding magnetism helps build motors, speakers, and medical tools.理解磁性有助于制造电机、扬声器和医疗设备。