希望是唯一比恐惧更强大的东西。
"Hope is the only thing stronger than fear."
我们必须将经济增长与环境退化脱钩。
I'm not the next Usain Bolt, I'm the first Usain Bolt.
The world needs your light, don’t dim it.
The essence of mathematics lies in its freedom.
I have come to believe that a great teacher is a great artist and that there are as few as there are any other great artists. Teaching might even be the greatest of the arts since the medium is the human mind and spirit.
优化是在给定约束条件下做出最佳决策的艺术。