Photo taken on July 5, 2019 shows robots competing at the Cross-strait robot competion in Nanjing, east China's Jiangsu Province. The competition was held with the involvement of 300 teams from middle schools, colleges and universities. Photo:China News Service

Photo taken on July 5, 2019 shows robots competing at the Cross-strait robot competion in Nanjing, east China's Jiangsu Province. The competition was held with the involvement of 300 teams from middle schools, colleges and universities. Photo:China News Service

Photo taken on July 5, 2019 shows robots competing at the Cross-strait robot competion in Nanjing, east China's Jiangsu Province. The competition was held with the involvement of 300 teams from middle schools, colleges and universities. Photo:China News Service

Photo taken on July 5, 2019 shows robots competing at the Cross-strait robot competion in Nanjing, east China's Jiangsu Province. The competition was held with the involvement of 300 teams from middle schools, colleges and universities. Photo:China News Service

Photo taken on July 5, 2019 shows robots competing at the Cross-strait robot competion in Nanjing, east China's Jiangsu Province. The competition was held with the involvement of 300 teams from middle schools, colleges and universities. Photo:China News Service

Photo taken on July 5, 2019 shows robots competing at the Cross-strait robot competion in Nanjing, east China's Jiangsu Province. The competition was held with the involvement of 300 teams from middle schools, colleges and universities. Photo:China News Service