用历史交往论，对世界帝国的兴衰史和文明交往进行了系统的分析。
In this paper, the author made a systemic analysis of world empires' history, using the theory of historical contact.
城市的兴衰记载了一个国家和民族孕育、成长、奋斗的历史，记载了人类文明的历史进程。
The prosperity and decline of the cities bear the weight of the breeding, growing and struggling history of a country and a nationality, and records the history of human civilization.
城市的兴衰记载了一个国家和民族孕育、成长、奋斗的历史，记载了人类文明的历史进程。
The prosperity and decline of the cities bear the weight of the breeding, growing and struggling history of a country and a nationality, and records the history of human civilization.
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