无政府状态是战争的允许性原因；它创造了一个国家必须依靠自助来确保生存的环境。

The best businesses are built on passion, not just profit.

形容创业的艰辛

"In observational studies, we often have to rely on assumptions that are not directly testable."

价值创新是蓝海战略的基石。