Students compete in the event of Dominoes during the 6th technology competition for middle and primary school students in Qiaoxi District of Shijiazhuang, capital of north China's Hebei Province, Dec. 22, 2017. (Xinhua/Zhang Shuo)
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Students compete in the event of Dominoes during the 6th technology competition for middle and primary school students in Qiaoxi District of Shijiazhuang, capital of north China's Hebei Province, Dec. 22, 2017. (Xinhua/Zhang Shuo)
