测量不可测量之物需要的不仅是技术，还有想象力。

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

I'm not a person who gives up on my light.

一个国家的真正财富来自于它的土壤。

最深的伤口是看不见的。

解释：手指粗于胳膊， 胳膊粗于大腿， 病情必然很重。

心理学概念的价值在于其生活应用。

The spread of liberal democracy around the world is not inevitable, but it is the most likely outcome of the historical process.