BEIJING, April 11, 2016 (Xinhua) -- Tourists visit the terraced fields in the early morning in Yuanyang County, Honghe Hani and Yi Autonomous Prefecture in southwest China's Yunnan Province, Jan. 25, 2015. 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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