可持续性不仅仅是植树；而是在正确的地方种植正确的树木，并确保它们世代繁茂。

I don't know. Sometimes when I feel about to cry, it often evolves into an impulse to almost laugh. That must have been how I really felt at the time, because I laughed, almost giggled.

好与伟大之间的区别在于对细节的关注。

纯数学和应用数学之间的相互作用是真正创新发生的地方。