图书馆的存在本身就提供了最好的证据,证明我们对人类的未来仍可抱有希望。
Learning is not a matter of trial and error, but of insight.
Every mathematical problem is a window into a deeper understanding of the world.
重复别人是一个很好的开始。重复你自己则是一个令人失望的终点。