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Children play marbles at a primary school in Handan in north China's Hebei Province, May 31, 2018. People held various activities to observe the International Children's Day across China. (Xinhua/Hu Gaolei)
Children play marbles at a primary school in Handan in north China's Hebei Province, May 31, 2018. People held various activities to observe the International Children's Day across China. (Xinhua/Hu Gaolei)