Children visit Yangzhou Science and Technology Museum in Yangzhou, east China's Jiangsu Province, July 29, 2018. Children take part in various classes and activities to enrich their summer vacation life. (Xinhua/Meng Delong)

Children watch robot dancing at Yangzhou Science and Technology Museum in Yangzhou, east China's Jiangsu Province, July 29, 2018. Children take part in various classes and activities to enrich their summer vacation life. (Xinhua/Meng Delong)

Children visit Yangzhou Science and Technology Museum in Yangzhou, east China's Jiangsu Province, July 29, 2018. Children take part in various classes and activities to enrich their summer vacation life. (Xinhua/Meng Delong)