File photo taken on July 24, 2011 shows the scenery of karst landform in Dacai Township under Maonan Autonomous County of Huaijiang, south China's Guangxi Zhuang Autonomous Region. The World Heritage Committee on Monday inscribed an extension of South China Karst, a natural World Heritage Site since 2007, into the UNESCO's World Heritage List. (Photo by Wang Xiufa/Xinhua)

This picture taken on September 9, 2014 shows a waiteress handing over food to customers at a prison themed restaurant in Tianjin. As more themed restaurants are popular in China, a “prison style” restaurent in Tianjin is aimed at reminding people to observe the law and to be good citizens. (Photo by Wang Zhao/AFP Photo)

People pass a suitcase as they line up to enter a railway station in Beijing, February 15, 2015. Chinese Ministry of Transport said a total of 2.807 billion trips are expected to be made during the 40-day Spring Festival travel rush, which started on February 4 and will last until March 16, Xinhua News Agency reported. (Photo by Reuters/Stringer)

An aerial view of paddy fields at Debao County on October 16, 2022 in Baise, Guangxi Zhuang Autonomous Region of China. The paddy fields in Baise have entered harvest season. (Photo by VCG/VCG via Getty Images)

Children stand next to an image of a Chinese space suit displayed on a screen, at the InnoTech Expo in Hong Kong, China on December 13, 2022. (Photo by Tyrone Siu/Reuters)

Girls from the Miao ethnic group dress up in ethnic costumes to celebrate the traditional Lusheng Festival on December 12, 2022 in Congjiang County, Qiandongnan Miao and Dong Autonomous Prefecture, Guizhou Province of China. (Photo by Mo Xiaoshu/VCG via Getty Images)

Visitors look out from a balcony in a quiet mall area with closed retail shops and restaurants only offering takeaway on Tuesday, May 10, 2022, in Beijing. China's capital began another round of three days of mass testing for millions of its residents Tuesday in a bid to prevent an outbreak from growing to Shanghai proportions. (Photo by Ng Han Guan/AP Photo)

A man walks with his dog riding on a scooter across a square on August 9, 2022 in Nanjing, Jiangsu Province of China. (Photo by Yang Bo/China News Service via Getty Images)