The past is never dead. It's not even past.
The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter.
可持續(xù)捕撈不是一種選擇，而是對后代的責(zé)任。
真正的數(shù)學(xué)家始終是學(xué)生，永遠(yuǎn)在學(xué)習(xí)。