Sanxingdui relics: What is the secret of the bronze heavenly tree?

The 3,000-year-old Sanxingdui ruins site in southwest China's Sichuan Province has yielded some extraordinary archaeological finds.The 3.9-meter-tall bronze heavenly tree is one of them. It sheds some light on the Shu culture thousands of years ago. How was the tree restored and what is the secret of the tree?

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