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。

Laughter and tears are both responses to frustration and exhaustion. I myself prefer to laugh, since there is less cleaning up to do afterward.

我不逃避挑战，我奔向挑战。

"The only way to do great work is to love what you do."

如果战斗不可避免，先发制人。