It is because nations tend to stupidity and baseness that democracy is possible.
计算学习理论中的挑战在于理解学习算法的能力和局限性。
Sometimes, the hardest thing in life is to know which bridge to cross and which to burn.
起初他们忽视你,然后嘲笑你,接着与你对抗,最后你获胜。