Pic Title: Zheng drainage canal ancient Guanzhong irrigated plains Related Phrase: 郑国渠: 古代关中平原上的人工灌溉渠 Related pictures: Zheng drainage canal ancient Guanzhong irrigated plains Source: http://economy.guoxue.com/ Pic Description: 　　Development of the Warring States to Northern irrigation canal projects _ Chinese Economic History Forum From the foregoing, the Han Dynasty unified due Translated by Google No. / 2 Picture

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