The only limit to our realization of tomorrow is our doubts of today.
实现明天的唯一限制是我们今天的疑虑。
The hardest single part of building a software system is deciding precisely what to build.
Mathematics knows no races or geographic boundaries; for mathematics, the cultural world is one country.
Law is a system of rules that are enforced through social institutions to govern behavior.
天空是极限，对吧？