这就是学习的意义。你突然以一种新的方式理解了你一生都理解的东西。

The difference between ordinary and extraordinary is that little extra.

Success is a function of persistence and doggedness and the willingness to work hard for twenty-two minutes to make sense of something that most people would give up on after thirty seconds.

行为是行为发生时场域的函数。

Every problem in NP can be reduced to the satisfiability problem, which is the cornerstone of computational complexity theory.