The magnetic state of a bar magnet or a horseshoe magnet is extremely complicated. 條形磁鐵或馬蹄形磁鐵的磁態(tài)是極其復雜的。
Fluid iron in the planet's core acts like a huge bar magnet, creating a relatively weak magnetic field. 地心處的液態(tài)鐵就像一個(gè)巨大的條形磁鐵，會(huì )形成相對較弱的磁場(chǎng)。
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