Problem solving is the central activity of intelligent systems.
The world is a book, and those who do not travel read only one page.
理解生命的唯一方式是去经历它。
To live is the rarest thing in the world. Most people exist, that is all.
奶牛养殖既是一门艺术也是一门科学——尊重两者对于成功至关重要。