这并不仅仅是一条物理规律，还有其深厚的文化表述：异性相吸。
It's not just a rule in physics. There's a strong cultural expression: opposites attract.
数学法则，从古至今，放之四海而皆准，亘古不变。欧几里德、欧拉，以及其他数学家们，只不过是发现了这些规律，加以文字表述而已。
Mathematical laws are universal and have remained unchanged since the beginning of time. Euclid, Euler and all the others discovered and put into words things that were already there.
由于人类认识世界的共性和诉讼的规律性，各国的证明标准虽然表述不同，但在运作上也存在上述共性。
As the commonness of people's cognition of the world and the principal of lawsuit, the standards of proof in different country are different in expression and same in operation.
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