有人认为是内战或外族入侵导致文明毁于一旦。
Some people thought that is the civil war or other families invasion causes the civilization to be destroyed in a moment.
在受到外族入侵而消失之前，王国繁盛长达700多年。
It flourished for more than 700 years before encountering civil strife and foreign attacks and falling into disrepair.
它始建于2000多年前的春秋战国时期，作为抵御外族入侵的防御工事。
The wall was originally built in the Spring and Autumn, and the Warring States Periods as a defensive fortification.
它始建于2000多年前的春秋战国时期，作为抵御外族入侵的防御工事。
The wall was originally built in the Spring and Autumn, and the Warring States Periods as a defensive fortification.
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