成功就是带着热情从一个失败走向另一个失败。
There are two ways to extend a business. Take inventory of what you are good at and extend out from your skills. Or determine what your customers need and work backwards, even if it requires learning new skills.
数学的本质在于它的自由。
世界是一个充满阴影的地方,而我们则是穿行其中的幽灵。