生命中令人悲伤的一件事是你遇到了一个对你来说很重要的人,但却最终发现你们有缘无份,因此你不得不放手。
I don't have any particular recipe [for developing new proofs] ... It is the reason why doing research is challenging as well as attractive. It's like being lost in a jungle and trying to use all the knowledge that you can gather to come up with some new tricks, and with some luck you might find a way out.