Centuries ago, historians came up with a classic theory to explain the rise and decline of nations.
2
然后我想到的第二股驱动力仍然是各国之间的竞争与交往，或者说是大国的兴衰起伏。
And then the second driving force I can think of is still the traditional competitions and relations between nation states, or the rise and fall of great powers.
3
因此，对大国的兴衰及其规律进行研究已经成为国际关系研究的一个重要领域。
So the study on the rise and fall of great powers and its laws has become an important field in the study of international relations.
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