The wild is a place of danger. To survive, you have to respect it.

学习数学的最好方法就是去做数学。

经验是一所好学校，但学费很高。

The most glorious moments in your life are not the so-called days of success, but rather those days when out of dejection and despair you feel rise in you a challenge to life, and the promise of future accomplishment.

可持续性不是一种趋势，而是我们对后代的责任。

人类的高贵来自于你就是你，你不是别人的复制品。