《General History of China》E71
Touring both places
The implementation of this system not only maximizes the spatial conditions for normal agricultural production in Dadu, but also realizes rotational grazing of livestock between Dadu and Shangdu, providing the greatest guarantee for the summer growth and winter survival of livestock.The two-capital patrol system maximized the economic benefits of agriculture and animal husbandry on the premise of maintaining and strengthening the military strength of the metropolitan areas.
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