Patience and perseverance are the keys to scientific discovery.

你必须投入时间，因为总有你可以改进的地方。

The security dilemma is a fundamental feature of international politics, as states' efforts to increase their own security often decrease the security of others.

制度的质量是一个国家成败的关键决定因素。

灵魂被其思想的颜色所染色。