A mathematician's work is never done; there are always new questions to ask and new mysteries to solve.

幸福就在脚下，只要你愿意低头寻找。

柴油发动机是当今已知效率最高的原动机。

"I don't think of my work as being for children or for adults. I just think of it as being."

战略思维很少自发产生。