The laser is to attosecond physics what the telescope was to astronomy.

"To be free is not merely to cast off one's chains, but to live in a way that respects and enhances the freedom of others."

Any change, even a change for the better, is always accompanied by drawbacks and discomforts.

There is no absolute fairness in life, but it is relatively fair.

失败不是必要的恶。事实上，它根本不是恶。它是做新事物的必然结果。