一个好的抽象是强调本质而抑制无关紧要的。
A good abstraction is one that emphasizes the essential and suppresses the irrelevant.
耳朵是负责听的，听了之后再加以审察，这叫做聪明。
The most important thing in science is not so much to obtain new facts as to discover new ways of thinking about them.
The world is full of people who have dreams and the world is full of people who have ideas, but the world is also full of people who never do anything about them.