The love of a teacher is like drops of dew, which can revive even a withered soul; the love of a teacher is like a warm spring breeze, which can melt even frozen emotions.
Buying tools: Start by buying the absolute cheapest tools you can find. Upgrade the ones you use a lot. If you wind up using some tool for a job， buy the very best you can afford.
动力学的方程是完全的，我们无需超越它们。
The more we study the more we discover our ignorance.
残酷的不是这个世界，而是世界里的人。
