A social system is a network of relations between persons and between groups.
社会系统是个人与个人之间、群体与群体之间关系的网络。
理解计算的极限需要深入研究支撑算法复杂性的数学基础。
学习数学的唯一方法就是做数学。
The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter.
唯一比被人谈论更糟糕的事情是没有人谈论你。