可归约性的概念对于理解不同计算问题之间的关系至关重要。
The best time to work on your marriage is before you have one.
The moment you give up is the moment you let someone else win.
唯一的出路就是穿过去。
I stand up for what I believe in, and I don't back down.
最美的风景在攀登最艰难的山峰之后。