过去是你记得的、你想象你记得的、你确信你记得的、或者你假装记得的。
Go for it now. The future is promised to no one.
可持续性已不再是一个选择;它是我们前进的唯一道路。
我已经不再年轻,不再无所不知。
The true value of a mathematician lies in the problems they leave behind.
A business has to be involving, it has to be fun, and it has to exercise your creative instincts.