Leadership is about making tough decisions and standing by them.

Economic development must be coordinated with environmental protection.

我们开采的岩石讲述着地球的故事；我们只是这份遗产的临时保管者。

"The 21st century is oppressed by a crushing sense of finitude and exhaustion."

我们能体验到的最美丽的事物是神秘。它是所有真正艺术和科学的源泉。

动力学的方程在用变分法的语言表达时是完全的。