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。

数学语言是通用的，超越了文化和语言的障碍。

The world is not a pleasant place to be, but it is the only one we have.

有道德的人能够反思自己过去的行为及其动机。

The value of a commodity, or the quantity of any other commodity for which it will exchange, depends on the relative quantity of labor which is necessary for its production, and not on the greater or less compensation which is paid for that labor.

中国半导体产业要敢于挑战高端，不能只满足于低端制造。