All living organisms need metabolism, otherwise life will stop. The same is true of civilization, if it is closed to itself for a long time, it is bound to decline. Exchange and mutual learning is the essential requirement of the development of civilization. Only by communicating with other civilizations and learning from each other's strong points to make up for their weaknesses can we maintain exuberant vitality.
If a civilization does not have exchanges and mutual learning with other civilizations, it cannot maintain its exuberant vitality can be concluded based on this.