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English

Paul Dirac observed in 1931 that, because electricity and magnetism show a certain symmetry, just as quantum theory predicts that individual positive or negative electric charges can be observed without the opposing charge, isolated South or North magnetic poles should be observable.

Chinese

保罗·狄拉克在1931年断言,因为电场与磁场表现出某種对称性,就像在量子理论预言的正电荷或者负电荷并不需要相反的电荷存在,独立的南极或者北极应该也能被观测到。