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。
I love to practice. When I'm not playing, I'm practicing.
People don’t notice whether it’s winter or summer when they’re happy.
Hard work, under the old system, meant doing as little as possible.
一个人想欺骗人类，首先必须化腐朽为神奇。