The concept of polynomial-time reduction is central to understanding the structure of NP-complete problems.

"The only real failure in life is not to be true to the best one knows."

What's the point of having a voice if you're gonna be silent in those moments you shouldn't be?

Ignoring isn’t the same as ignorance, you have to work at it.

我喜欢旅行，但不喜欢到达目的地。