Giant panda "Hai Hai" plays at the Jiuzhaigou panda park in southwest China's Sichuan Province, June 19, 2020. Four giant pandas from the China Conservation and Research Center for the Giant Panda officially met the public at the Jiuzhaigou panda park recently.

Giant panda "Xin Xin" plays at the Jiuzhaigou panda park in southwest China's Sichuan Province, June 19, 2020. Four giant pandas from the China Conservation and Research Center for the Giant Panda officially met the public at the Jiuzhaigou panda park recently.

A giant panda eats a bamboo shoot at the Jiuzhaigou panda park in southwest China's Sichuan Province, June 19, 2020. Four giant pandas from the China Conservation and Research Center for the Giant Panda officially met the public at the Jiuzhaigou panda park recently.

Combo photo taken on June 19, 2020 shows giant panda "Xin Xin" playing at the Jiuzhaigou panda park in southwest China's Sichuan Province. Four giant pandas from the China Conservation and Research Center for the Giant Panda officially met the public at the Jiuzhaigou panda park recently.

Giant panda "Hai Hai" plays at the Jiuzhaigou panda park in southwest China's Sichuan Province, June 19, 2020. Four giant pandas from the China Conservation and Research Center for the Giant Panda officially met the public at the Jiuzhaigou panda park recently.

Giant panda "Xin Xin" plays at the Jiuzhaigou panda park in southwest China's Sichuan Province, June 19, 2020. Four giant pandas from the China Conservation and Research Center for the Giant Panda officially met the public at the Jiuzhaigou panda park recently.

A giant panda is seen at the Jiuzhaigou panda park in southwest China's Sichuan Province, June 19, 2020. Four giant pandas from the China Conservation and Research Center for the Giant Panda officially met the public at the Jiuzhaigou panda park recently.

Giant panda "Hai Hai" eats a bamboo shoot at the Jiuzhaigou panda park in southwest China's Sichuan Province, June 19, 2020. Four giant pandas from the China Conservation and Research Center for the Giant Panda officially met the public at the Jiuzhaigou panda park recently.

A giant panda eats a bamboo shoot at the Jiuzhaigou panda park in southwest China's Sichuan Province, June 19, 2020. Four giant pandas from the China Conservation and Research Center for the Giant Panda officially met the public at the Jiuzhaigou panda park recently. (Photos: Xinhua)