追求知识是一段永无止境的旅程，每一个发现都为新的问题打开了大门。

States are inherently aggressive and expansionist because they exist in an anarchic international system where there is no higher authority to keep them in check.

银河系的黑洞是我们研究极端引力的最近实验室。

农民的福利就是国家的福利。