【彩神APP争霸8平台_彩神APP争霸8平台官网】Science, technology festival held in central China's Hubei

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A teacher explains how sci-tech gadgets work to students during a science and technology festival held at Youfangjie Primary School in Chengguan Town in Baokang County, central China's Hubei Province, April 19, 2018. (Xinhua/Yang Tao)