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What does Dujiangyan irrigation network mean?

Dujiangyan irrigation system is like a net. Li Bing, the prefect of Shu County of Qin State, presided over the construction of Dujiangyan on the Minjiang River near Chengdu. Dujiangyan irrigation network means that Dujiangyan irrigation system is like a network. River networks spread all over the western Sichuan plain, irrigated 27 counties and cities, and irrigated nearly 9 million mu of land, more than twice as much as before the founding of New China.