种一棵树最好的时间是20年前，其次是现在。

The beauty of physics lies in its ability to explain the complex with the simple.

人生起落无常，低谷时别放弃。  

The study of computation is essential to understanding the limits of what can be computed.

最难的事情是简单。

想指挥乐队的人必须背对人群。

实验室里的秒表，丈量着人类灵魂的振动频率。