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.
Sheldon是搞弦论的理论物理学家，而弦论也预言了磁单极子的存在。
Sheldon is a string theorist, and string theory also predicts the existence of magnetic monopoles.
研究了套筒单极子天线的优化设计。
In this paper, the optimization of sleeve monopole antennas is studied.
研究了套筒单极子天线的优化设计。
In this paper, the optimization of sleeve monopole antennas is studied.
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