Tourists visit the Yungang Grottoes in Datong, north China's Shanxi Province, on May 9, 2021.Photo:Xinhua
Wang Chao, a technician with the Yungang Grottoes Research Institute, collects digital image data at the Yungang Grottoes in Datong, north China's Shanxi Province, on May 8, 2021.Photo:Xinhua
Sun Bo (L), a technician with the Yungang Grottoes Research Institute, maintains a piece of relics at the Yungang Grottoes in Datong, north China's Shanxi Province, on May 7, 2021.Photo:Xinhua
He Yu (R), a technician with the Yungang Grottoes Research Institute, learns to restore a piece of relics from a senior colleague in his studio in Datong, north China's Shanxi Province, on May 8, 2021.Photo:Xinhua
Hai Jianyu, a technician with the Yungang Grottoes Research Institute, restores a piece of mural in his studio in Datong, north China's Shanxi Province, on May 9, 2021.Photo:Xinhua
Sun Bo, a technician with the Yungang Grottoes Research Institute, maintains a piece of relics at the Yungang Grottoes in Datong, north China's Shanxi Province, on May 7, 2021.Photo:Xinhua
Jia Ning, a technician with the Yungang Grottoes Research Institute, restores a piece of mural at his studio in Datong, north China's Shanxi Province, on May 9, 2021.Photo:Xinhua
Guan Jianling, a technician with the Yungang Grottoes Research Institute, colors a piece of pottery in her studio in Datong, north China's Shanxi Province, on May 8, 2021.Photo:Xinhua