每个区域都是自然和文化元素的综合体。

程序最重要的属性是它是否实现了用户的意图。

Safety isn't a department - it's a culture that starts at the very top.

Theorems are not discovered by accident.

Children have real understanding only of that which they invent themselves, and each time that we try to teach them something too quickly, we keep them from reinventing it themselves.