Participants look at a map to select ski runs during a fixed-point ski racing at Beidahu ski resort of Jilin city, Northeast China's Jilin Province, Dec. 27, 2020. Over 300 participants from all over the country took part in the ski racing which kicked off here on Sunday. (Photo: Xinhua)

This aerial photo taken on Dec 29, 2020 shows the Heshandu Wujiang River Bridge under construction in Southwest China's Guizhou Province. The bridge, with an overall length of 2,000 meters, is a key project of the Meitan-Shiqian expressway. (Photo: Xinhua)

This aerial photo taken on Dec 30, 2020 shows students playing games at the playground of a school built at a resettlement area for relocated impoverished households, in Qianxi county of Bijie city, Southwest China's Guizhou Province. (Photo: Xinhua)

A grand national flag-raising ceremony is held as part of the celebrations for New Year's Day at Tian'anmen Square in Beijing, capital of China, Jan 1, 2021. (Photo: Xinhua)

Folk artists perform a dragon dance amid showers of molten iron during an event to greet the New Year at Taierzhuang ancient town in Zaozhuang city, East China's Shandong Province, Dec 31, 2020. (Photo: Xinhua)

A firework show is held to celebrate the New Year in Minsk, Belarus, Jan 1, 2021. (Photo: Xinhua)

Medical workers deal with swab samples at a coronavirus testing site in Tiexi district of Shenyang, Northeast China's Liaoning Province, Jan 1, 2021. Shenyang is conducting nucleic acid tests for all residents in nine districts starting Thursday, local authorities said. (Photo: Xinhua)

Workers walk down a corridor of a hospital in New York, the United States, Jan 1, 2021. The total number of COVID-19 cases in the US topped 20 million on Friday, according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. (Photo: Xinhua)

The image of a broken heart and words of "Zagreb for Banovina" is projected onto a fountain to express solidarity with earthquake victims in Zagreb, Croatia, on Jan 2, 2020. A 6.4-magnitude earthquake hit central Croatia on Tuesday, killing seven and injuring dozens. (Photo: Xinhua)

Two red pandas play with each other after a snowfall at Yancheng Safari Park in Changzhou, Jiangsu Province, Dec 30, 2020. Animals from the park came out and played in the snow after it cleared Wednesday. (Photo: Ecns)