Visitors view exhibits at a special exhibition on the prehistoric Sanxingdui Ruins held at the Museum of Shanghai University in east China's Shanghai, Nov. 21, 2020. (Xinhua/Ren Long)

Visitors view exhibits at a special exhibition on the prehistoric Sanxingdui Ruins held at the Museum of Shanghai University in east China's Shanghai, Nov. 21, 2020. (Xinhua/Ren Long)

A bronze head is on display at a special exhibition on the prehistoric Sanxingdui Ruins held at the Museum of Shanghai University in east China's Shanghai, Nov. 21, 2020. (Xinhua/Ren Long)

Zhu Jiake, executive deputy curator of the Sanxingdui Museum, introduces an exhibit at a special exhibition on the prehistoric Sanxingdui Ruins held at the Museum of Shanghai University in east China's Shanghai, Nov. 21, 2020. (Xinhua/Ren Long)

The replica of a masked bronze head is on display at a special exhibition on the prehistoric Sanxingdui Ruins held at the Museum of Shanghai University in east China's Shanghai, Nov. 21, 2020. (Xinhua/Ren Long)

Visitors watch an online live broadcast about the excavation of a ritual cave at the opening ceremony of a special exhibition on the prehistoric Sanxingdui Ruins held at the Museum of Shanghai University in east China's Shanghai, Nov. 21, 2020. (Xinhua/Ren Long)