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剑鞘保护剑的锋利,自己却满足於它自己的迟钝。
"The most important thing in empirical work is to be clear about the question you are trying to answer."
I don't mind being a symbol but I don't want to become a monument. There's a difference.
对称性不仅是自然的一种属性,而且是寻找物理定律的指导原则。