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Students play with a gear model at a primary school in Yantai, east China's Shandong Province, May 31, 2018. People held various activities to observe the International Children's Day across China. (Xinhua/Tang Ke)
Students play with a gear model at a primary school in Yantai, east China's Shandong Province, May 31, 2018. People held various activities to observe the International Children's Day across China. (Xinhua/Tang Ke)