世界是一个伟大的轮子，我们是其中的辐条。
If you go back a few hundred years, what we take for granted today would seem like magic—being able to talk to people over long distances, to transmit images, flying, accessing vast amounts of data like an oracle. These are all things that would have been considered magic a few hundred years ago.
数学的美在于它既精确又富有创造性。
图画是第一位的，文字是后来才有的。
The only limits you have are the ones you place on yourself.
