"The past is a foreign country; they do things differently there."

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。

The most exciting breakthroughs often come from interdisciplinary research.

I don't let the world dull my sparkle.