无常是生死的自然法则。

It really matters whether people are working on generating clean energy or improving transportation or making the Internet work better and all those things. And small groups of people can have a really huge impact.

可归约性的概念对于理解不同计算问题之间的关系至关重要。

人生苦短，必须快乐。

预测未来的最好方法就是发明它。