The only way to have a friend is to be one.
There are some things so serious you have to laugh at them.
The best way to learn something is to teach it.
在竞争激烈的市场中保持领先的关键是创新。
The key to the realization of desire is the feeling of its reality.
The bigger the crowd, the more unnatural the picture.
数学的研究是所有智力和精神进步不可或缺的基础。