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How Do Magnets Work?
磁铁是如何工作的？
精读先不看文字，完整听一遍。
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Magnets create invisible fields of force that attract certain metals like iron, nickel, and cobalt.磁铁会产生看不见的力场，吸引铁、镍、钴等特定金属。
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Every magnet has two poles: north and south—and opposite poles pull toward each other while like poles push apart.每块磁铁都有两个磁极：北极和南极；异极相吸，同极相斥。
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These magnetic forces come from the motion of electrons spinning and orbiting inside atoms of magnetic materials.这些磁力源于磁性材料原子内电子的自旋与绕核运动。
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In unmagnetized iron, these tiny atomic magnets point in random directions, canceling each other out.未磁化的铁中，这些微小的原子磁体方向杂乱，彼此抵消。
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When exposed to a strong magnetic field, many of those atomic magnets line up and reinforce one another.当暴露于强磁场时，大量原子磁体排列一致，相互增强。
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Earth itself acts like a giant magnet, with its magnetic field stretching far into space and protecting us from solar wind.地球本身就像一块巨型磁铁，其磁场延伸至太空深处，保护我们免受太阳风侵袭。
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Compasses work because their magnetized needles align with Earth’s magnetic field lines, pointing toward magnetic north.指南针依靠磁化指针与地球磁场线对齐，指向磁北。
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Heating or hammering a magnet can scramble its aligned atoms and weaken or destroy its magnetism.加热或敲击磁铁会打乱其原子排列，削弱甚至消除磁性。
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Some animals, including pigeons and sea turtles, have tiny magnetic crystals in their bodies to help them navigate long distances.某些动物（如鸽子和海龟）体内含有微小磁性晶体，辅助长距离导航。
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Unlike electric charges, magnetic poles always come in pairs—you cannot isolate a single north or south pole.与电荷不同，磁极总是成对出现——无法分离出单独的北极或南极。
精读 · 大约 10 分钟
听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。
③ 学 · 重点表达
- Magnets create invisible fields of force that attract certain metals like iron, nickel, and cobalt. 磁铁会产生看不见的力场，吸引铁、镍、钴等特定金属。
- In unmagnetized iron, these tiny atomic magnets point in random directions, canceling each other out. 未磁化的铁中，这些微小的原子磁体方向杂乱，彼此抵消。
- Compasses work because their magnetized needles align with Earth’s magnetic field lines, pointing toward magnetic north. 指南针依靠磁化指针与地球磁场线对齐，指向磁北。
④ 懂 · 选一选
⑤ 今天会说这一句
Magnets create invisible fields of force that attract certain metals like iron, nickel, and cobalt.
⑥ 跟读并录音
Magnets create invisible fields of force that attract certain metals like iron, nickel, and cobalt.
第一版：录下来、回听、再听标准音。系统打分以后再加。
⑦ 说 · 自己来一句
用今天的表达，自己说一句。
例子：Magnets create invisible fields of force that attract certain metals like iron, nickel, and cobalt.
已记下。连续天数以后会显示在课表里。
陈老师指导
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