You don't write because you want to say something, you write because you have something to say.

城市是社会的一面镜子。

孩子有超强的记忆力，当孩子可以动手操作而仅用眼看时，会记得更好。

纠正一个错误与建立一个新的真理或事实同样有益，有时甚至更好。

I went to the woods because I wished to live deliberately. I wanted to live deep and suck out all the marrow of life, to put to rout all that was not life.

近似算法证明了在实现实际解决方案中妥协的力量。