数学不是关于数字、方程、计算或算法:它是关于理解的。
"Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding."
We are made of star stuff.
美德是通过努力获得的,这完全取决于你自己。
If you don't make mistakes, you're not trying hard enough.
True sustainability means leaving the land better than we found it for future generations.