你最不满意的客户是你最好的学习来源。

数学不仅仅是关于数字和方程；它是关于理解宇宙中一切事物的模式和结构。

Quality is not a claim; it is a evidence.

The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.

规范是命令、允许或授权某种行为的行动的意义。