To understand a program you must become both the machine and the program.
要理解一个程序，你必须同时成为机器和程序。
英雄是一时的，但传奇是一世的。
在地球系统的伟大运作中，现在的力量与古代相同。
Every small step toward sustainability compounds into a wave of global impact.
爱是一切的关键。
The beauty of mathematics lies not only in its ability to describe the world but also in its power to reveal the hidden structures that govern it.
I can calculate the motions of the heavenly bodies， but not the madness of people.
Sustainability isn't a choice; it's our responsibility to future generations.