BEIJING, April 11, 2016 (Xinhua) -- Photo taken on July 4, 2014 shows terraced fields in mountainous area of Dingxi City, northwest China's Gansu Province. China has perfected the art of building terraced fields as an effective way to preserve water and soil, and had a long history of terracing the ridges for high-yield cropping. (Xinhua/Wang Song)
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