形式验证的挑战在于弥合抽象模型与实际实现之间的差距。

We don't just sell beverages—we sell moments of refreshment in people's lives.

I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection.  

对事物感到困惑的能力是所有创造的前提，无论是在艺术还是在科学领域。