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://a3.att.hudong.com/ Pic Description: 　　Travel Guide] China four ancient water conservancy project - the return - the return - and the news blog Zheng drainage is the first large-scale water conservancy construction in Guanzhong Translated by Google No. / 2 Picture

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