Pupils view 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. (Xinhua/Huang Xiaohai)

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. (Xinhua/Huang Xiaohai)

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. (Xinhua/Huang Xiaohai)

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. (Xinhua/Huang Xiaohai)

Pupils control a robot arm 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. (Xinhua/Huang Xiaohai)

A little girl assembles a solar-powered car 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. (Xinhua/Huang Xiaohai)