Great deeds are usually wrought at great risks.

You get what you give. What you put into things is what you get out of them.

世界历史可以这样总结：强国总行不义。等到他们醒悟了，他们不已经不再强了。

量子力学的数学形式不仅仅是一种工具，而且是现实深层结构的反映。