过去总是与我们同在，它塑造了我们是谁以及我们成为什么。
The past is always with us, and it shapes who we are and what we become.
The simplest solutions are often the most elegant.
Leadership is about making the tough decisions and standing by them, even when they're unpopular.
The P versus NP problem is one of the most important unsolved problems in computer science.