不要烦恼啊不要烦恼，心怀烦恼的人更容易衰老。

一个好的数学问题的定义是它产生的数学，而不是问题本身。

The farmer is the only man in our economy who buys everything at retail, sells everything at wholesale, and pays the freight both ways.

The truth is often hidden in the shadows, and it takes courage to find it.

每场比赛对我来说都是一次新的挑战。