Pupils learn about the structure of an intelligent robot during a scientific carnival at a youth activity center in Danzhai county, Qiandongnan Miao and Dong autonomous prefecture, southwest China’s Guizhou province, Aug 12, 2018.[Photo/Xinhua]

Pupils view electric robot arms controlled by a volunteer during a scientific carnival at a youth activity center in Danzhai county, Qiandongnan Miao and Dong autonomous prefecture, Southwest China’s Guizhou province, Aug 12, 2018. [Photo/Xinhua]

Pupils view 3D printing technology during a scientific carnival at a youth activity center in Danzhai county, Qiandongnan Miao and Dong autonomous prefecture, Southwest China’s Guizhou province, Aug 12, 2018.[Photo/Xinhua]