粒子的概念只是一个近似,在经典极限下有效。
数学中最深刻的见解往往来自最抽象的理论。
The only thing I care about is the art. If I can't be creative, I don't really see the point in doing anything else.
我想说的是,从长远来看,共产中国很可能比苏联更处于扩张阶段……从策略上,中共可能是更大的威胁。
The elevation of life is determined by the elevation of character.