You have to fight through some bad days to earn the best days of your life
过去是一个跟随我们的影子，一个困扰我们的幽灵。
Bringing computers into the home won't change either one, but may revitalize the corner saloon.
数学中最重要的是理解概念，而不仅仅是记忆公式。
在观察的领域里，机遇只偏爱那种有准备的头脑。