能量守恒定律不仅是一条经验法则，更是思维的必然要求。
"Sometimes you have to accept that some people are just not meant to stay in your life forever."
君子以品德不修为耻，不以被污蔑为耻；以不诚信为耻，不以不被信任为耻；以无能耐为耻，不以不被任用为耻。
"To be useful was the best thing the old men ever hoped for themselves, and to be aimless was their worst fear."