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. (Photos: Xinhua)

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.

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.

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.

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.

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.