每一个数学问题都是一个等待解决的谜题,每一个解答都是向理解现实结构迈进的一步。
今天很好,今天很有趣。明天又是新的一天。
We must mine coal responsibly today so that our children inherit both energy security and a healthy environment.
Failure is just a stepping stone to success. It's not the end, it's just part of the journey.