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How Do Magnets Stick to Some Metals?
磁铁为什么能吸住某些金属？
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Magnets have two ends: north and south poles.磁铁有两端：北极和南极。
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They create an invisible force field called magnetism.它们产生一种名为磁力的无形力场。
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Only iron, nickel, and cobalt feel this force strongly.只有铁、镍和钴能明显感受到这种力。
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Tiny parts inside these metals can line up with the field.这些金属内部的微小部分可与磁场对齐。
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When they line up, the metal becomes a temporary magnet.一旦对齐，金属就变成临时磁体。
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Opposite poles attract; same poles push apart.异极相吸，同极相斥。
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Not all metals respond — aluminum and copper do not stick.并非所有金属都有反应——铝和铜不会被吸附。
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Magnetism works without touching, even through paper or plastic.磁力无需接触即可作用，甚至能穿透纸张或塑料。