File photo shows staff members repairing the bronze mask discovered at the Sanxingdui Ruins site in southwest China’s Sichuan Province. (National Cultural Heritage Administration/Handout via Xinhua)

File photo shows staff members repairing the bronze mask discovered at the Sanxingdui Ruins site in southwest China’s Sichuan Province. (Sichuan Provincial Cultural Relics and Archaeology Research Institute & Sanxingdui Museum/Handout via Xinhua)

Combo photo shows a bronze mask discovered at the No. 3 sacrificial pit of the Sanxingdui Ruins site in southwest China’s Sichuan Province (top, photo taken on Sept. 3, 2021 by Wang Xi), and the repaired bronze mask (bottom, file photo provided by Sichuan Provincial Cultural Relics and Archaeology Research Institute & Sanxingdui Museum). (Xinhua)

File photo shows a back view of the repaired bronze mask discovered at the Sanxingdui Ruins site in southwest China’s Sichuan Province. (National Cultural Heritage Administration/Handout via Xinhua)

File photo shows a side view of the repaired bronze mask discovered at the Sanxingdui Ruins site in southwest China’s Sichuan Province. (National Cultural Heritage Administration/Handout via Xinhua)