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But Chen Ning Yang, called by us Frank Yang, (laughter) and Bob Mills put forward, 50 years ago, this generalization of Maxwell's equations, with a new symmetry. 50年前，杨振宁和罗伯特-米尔斯提出了杨-米尔斯理论，这种对麦克斯韦方程组的概括有全新的对称性。