真正的可持续性意味着为子孙后代留下比我们发现时更好的土地。
A vision without execution is merely a dream.
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.
弦理论的景观是广阔而复杂的,可能有10^500个不同的可能宇宙。