说出口的话无法收回,听到的话无法忘记。
"What is said cannot be unsaid, and what is heard cannot be unheard."
唯一交到朋友的方法就是自己先成为朋友。
Life is far too important a thing ever to talk seriously about.
每一个数学问题都是一个等待解决的谜题,每一个解决方案都是迈向更深入理解的一步。