The definition of a good mathematical problem is the mathematics it generates rather than the problem itself.

复杂很容易，简单却很难。

"The truth is rarely pure and never simple."

To conquer without risk is to triumph without glory.

我们不是从祖先那里继承了土地，而是从子孙那里借用了土地。

I'm a winner, and I like to win.

仇恨只会毁灭仇恨者。

皮革行业必须在不影响质量的情况下发展，以满足环境标准和消费者期望。