The essence of computational complexity is to understand the limits of what can be computed efficiently.

Tragedy is when I cut my finger. Comedy is when you walk into an open sewer and die.

We all live in the past, we take a minute to know someone, an hour to like someone , a day to love someone , but a whole life to forget someone.

成功不是终点，失败也不是致命的：重要的是继续前进的勇气。

俄罗斯的面貌反映在它的人民的眼中。