The notion of a Dirac measure makes sense on any set whatsoever.

狄拉克测度的概念在任何集合上都有意义。

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Later Dirac learnt the truth.

很久以后狄拉克才知道了真相。

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Dirac was an odd and difficult man.

狄拉克性情古怪、难于相处。

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Instead, Dirac interpreted it as antimatter and, four years later, it turned up in a real experiment.

ECONOMIST: Fundamental physics

The existence of anti-matter was first suggested by the theoretical physicist Paul Dirac in the 1930s.

BBC: The problem with anti-matter

Monopoles were first predicted in 1931 by Paul Dirac, the man who also predicted antimatter.

ECONOMIST: Magnetic monopoles: Absence of evidence | The