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It indicates the mature techniques of building water conservancy facilities and the dynasties capability of water resource utilization and environmental upgrade back then.

Guo xiaotaoLiu bing xinhuaLiu taoEmperor xiaowenInstitute of archaeologyChinese academy of social sciencesHenan provinceQianqiu gateChinese academyXiyou gardenNorthern wei dynastyLuoyang channels province photo henan