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Children show greeting cards made to mark the World Hello Day which falls on Nov. 21 annually at a kindergarten at Qingzhou City, east China's Shandong Province, Nov. 20, 2018. (Xinhua/Wang Jilin)
Children show greeting cards made to mark the World Hello Day which falls on Nov. 21 annually at a kindergarten at Qingzhou City, east China's Shandong Province, Nov. 20, 2018. (Xinhua/Wang Jilin)