Don't watch the clock; do what it does. Keep going.

和平不是没有战争，而是正义的胜利。

I have a dream that one day this nation will rise up and live out the true meaning of its creed.

"The best performances are those that come from a place of deep vulnerability and honesty."

可信因果推断的关键不仅是方法，还有方法与当前问题的契合度。

在观察性研究中，我们常常不得不依赖于无法直接检验的假设。

A good mathematician should be both rigorous and imaginative.

"We are all time travelers, moving forward at the speed of life, but always looking back."

真相很少是纯粹的，也从不简单。