过去无法改变，但未来可以。现在如何生活，将塑造未来。

史记

"In the study of algorithms, we often find that the most efficient solutions are also the most elegant."

音乐是我给世界的情书。

"The writer's duty is to disturb the peace, to question the unquestionable, and to reveal the hidden."

I didn't get to where I am by chasing mediocre opportunities.

Don't let yesterday take up too much of today.

解释：齐国是强国，利用它的强大进攻宋国，让他逞强，燕国就可以乘机打败齐国；齐国是大国，利用它的大国野心吞并宋国，增加土地，燕国就可以乘机进攻。