The PAC learning framework provides a formal way to quantify the learnability of a concept class.

"A great film is one that stays with you long after you've left the theater."

预测未来的最好方法就是设计它。

快乐的最好方法是活在当下。

No matter what you’re going through, there’s a light at the end of the tunnel.

他们曾说这城市是天堂，但我发现它是地狱。

In mathematics, the art of proposing a question must be held of higher value than solving it.