来自《耶鲁大学开放课程：新生有机化学 第5集 第5集》

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  And you can plot it in time or in space and get a wave.
  不论用时间或空间来作图 都能形成波
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  So that's the sense in which it's a wave.
  所以说光就是一种波
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  It's also, incidentally, a magnetic field;
  当然 它也是一个磁场
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  it's electromagnetic.
  一个电磁场
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  Maxwell dealt with things like that.
  麦克斯韦就做这方面的研究
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  And there's a magnetic field perpendicular to the electric field,
  此外 还有一个与电场垂直的磁场
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  but we don't care about it,
  这个我们先不关心
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  at least not until next semester
  至少在下学期
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  when we talk about nuclear magnetic resonance,
  我们讨论核磁共振前不用关心
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  because the electric field
  因为电场
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  is so much stronger in its effect on molecules.
  对分子的影响要大得多
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  Now, its effect is on charges; on electrons, on protons,
  它作用于电荷 电子 质子