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Aerial photo taken on March 18, 2019 shows a farm machinery operating at a field in Shuangfeng County, central China's Hunan Province. (Xinhua/Li Jianxin)
Aerial photo taken on March 18, 2019 shows a farm machinery operating at a field in Shuangfeng County, central China's Hunan Province. (Xinhua/Li Jianxin)