Police officers salute two police helicopters carrying a national flag and a police flag as they fly over the Bund in Shanghai on Monday, Chinese People's Police Day. Police officers around the country held a range of activities to celebrate the day, which was established by the central government in July 2020. (Photo: China Daily)

Activists hold images of nurses who died during the COVID-19 pandemic during a vigil in Lafayette Park on Thursday in Washington, D.C. (Photo: AFP)

Defending men's champion Serbia's Novak Djokovic practices on Margaret Court Arena ahead of the Australian Open tennis championship in Melbourne, Australia on Thursday. (Photo: AP)

Aerial photo taken on Wednesday shows enthusiasts skating on an ice rink in Qitaihe City, Northeast China's Heilongjiang Province. (Photo: Xinhua)

St. Louis city firefighters console one another after a firefighter was killed while battling a blaze in the Wells-Goodfellow neighborhood of St. Louis, Missouri on Thursday. (Photo: AP)

The 40th fleet of the Chinese People's Liberation Army (PLA) Navy set out from a military port in the city of Zhanjiang, south China's Guangdong Province, on Saturday to conduct an escort mission in the Gulf of Aden and the waters off Somalia. (Photo: Xinhua)

Tourists take photos at the Sun Island International Snow Sculpture Art Exposition in Harbin, Northeast China's Heilongjiang Province on Friday. (Photo: Xinhua)

Photo shows two kids on a 5633 train on Monday. The 5633 trains run between Puxiong and Panzhihua of Sichuan Province. The whole route is 353 kilometers with most of it in the mountain area in Liangshan. (Photo: China News Service)

Two pandas play with each other in snow in Wenchuan County of China's Sichuan Province, on Thursday. (Photo: China News Service)

A rare snowy owl perches on a bald eagle flagpole topper in front of Union Station in Washington on Thursday. (Photo: AP)