能量守恒定律是经验结果的概括。
The main task in life is simply this: to identify and separate matters so that I can say clearly to myself which are externals not under my control, and which have to do with the choices I actually control.
最甜美的果实往往来自最艰难的时节。
The writer is either a practicing recluse or a delinquent, guilt-ridden one.
