艺术不在于界限，而在于自由。

当且仅当所有投资者都持有均值-方差有效的投资组合时，市场组合才是有效的。

The spirit of a place gives birth to architecture.

Diplomacy is not about passively adapting to change, but actively shaping change.

We hope to use technology to help more people be seen and more voices be heard.

The concept of nondeterminism in computation is one of the most important ideas in computer science.

你必须把失败看作开始和中间，但绝不要把它当作终点。