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Sightseeing boats sail on the Shuanglong Lake in Xuan'en County, central China's Hubei Province, Dec. 3, 2017. (Xinhua/Song Wen)
Sightseeing boats sail on the Shuanglong Lake in Xuan'en County, central China's Hubei Province, Dec. 3, 2017. (Xinhua/Song Wen)