Photo taken on May 21, 2021 shows a magnetic-controlled, capsule-shaped gastroscope displayed at the 12th Expo Central China in Taiyuan city of North China's Shanxi province. The 12th Expo Central China kicked off in Taiyuan on May 21. [Photo/Xinhua]
Visitors watch a fire-fighting robot displayed at the 12th Expo Central China in Taiyuan city of North China's Shanxi province, May 21, 2021. [Photo/Xinhua]
People visit the 12th Expo Central China in Taiyuan city of North China's Shanxi province, May 21, 2021. [Photo/Xinhua]
Visitors watch a helicopter displayed at the 12th Expo Central China in Taiyuan city of North China's Shanxi province, May 21, 2021. [Photo/Xinhua]
Photo taken on May 21, 2021 shows an exterior view of the 12th Expo Central China in Taiyuan city of North China's Shanxi province. [Photo/Xinhua]
An exhibitor (1st R) introduces tea products to visitors at the 12th Expo Central China in Taiyuan city of North China's Shanxi province, May 21, 2021. [Photo/Xinhua]
Visitors watch exhibits displayed at the 12th Expo Central China in Taiyuan city of North China's Shanxi province, May 21, 2021. [Photo/Xinhua]
An exhibitor (1st L) introduces reflex bow products to visitors at the 12th Expo Central China in Taiyuan city of North China's Shanxi province, May 21, 2021. [Photo/Xinhua]
