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Aerial photo taken on Nov. 5, 2019 shows a paddy field in Nanniwan of Yan'an, northwest China's Shaanxi Province. (Xinhua/Liu Xiao)
Aerial photo taken on Nov. 5, 2019 shows a paddy field in Nanniwan of Yan'an, northwest China's Shaanxi Province. (Xinhua/Liu Xiao)