在20世纪的30年代，保罗·狄拉克甚至向我们提出了一个相信单磁极存在的比较充分的理由，他表示单极的存在可以反过来解释电子的存在。

In the 1930s, Paul Dirac gave us an even better reason to believe in monopoles, when he showed that their existence would in turn explain the existence of electrons.

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通过理论分析，利用理想二极管外加磁场的方法，证明了真空中热电子发射的电子动能分布符合费米-狄拉克分布。

When an ideal diode was alive under a magnetic field, it could emit a thermal electron from its negative plate.

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