实现明天理想的唯一障碍是今天的疑虑。

I am the only person in the world I should like to know thoroughly; but I don’t see any chance of it just at present.

The difference between theory and practice is that in theory, there is no difference between theory and practice, but in practice, there is.

创新不仅仅是技术的问题；它是关于改变思维方式并接受新的思考方式。