The old believe everything; the middle-aged suspect everything; the young know everything.

La colère est un breuvage empoisonné que l'on boit en espérant que l'autre en mourra.

"We overestimate what we can do in one year and underestimate what we can do in ten."

地球是一个动态的行星，其内部热量是地质变化的驱动力。