程序测试可以用来显示错误的存在，但永远不能显示它们的缺失！
Program testing can be used to show the presence of bugs, but never to show their absence!
The forest doesn’t need us; we need the forest.
Forgetting is the only victory over death.
电影不是关于道德，而是关于真相。
书籍是通往其他生活的窗户。