实现明天的唯一限制是我们今天的疑虑。
可持续发展不仅是一种趋势，更是一种责任。
The most important property of a program is whether it accomplishes the intention of its user.
定理不是偶然发现的。
Some books are to be tasted， others to be swallowed， and some few to be chewed and digested.
The beauty of mathematics lies in its ability to reveal hidden symmetries and truths.