misc. monoterminal ; uniterminal
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.
有一段时间，美国的力量曾遭到苏联的制衡，但自从冷战结束之后，美国已经成为单极世界的唯一超级大国。
For a while, U.S. power was checked by the Soviet Union, but since the end of the Cold War, America has been the sole superpower.
其中一个不稳定因素与美国在国际体系中的单极地位有关。
One destabilizing factor has to do with American unipolarity in the international system.
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