The deepest theorems often arise from the simplest observations.
最深刻的定理往往源于最简单的观察。
The process of making a film is like a journey, you never know where it will take you.
Always plan for the worst and hope for the best.
You have to have fun in life, otherwise you’re just going to be miserable.
地球形状的问题本质上是势理论中的一个问题。