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Zhoukou Ruins of the ancient city of Pingliangtai Sanxingdui ruins archaeology Henan cultural relic
02-15
![Zhoukou discovered the ancient urban drainage system, the pipe arrangement is exquisite, and the experts feel ashamed after seeing it[fig]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)