People wearing protective masks to prevent the spread of coronavirus, take photographs of Christmas tree and holiday decorations in Hong Kong, Tuesday, December 15, 2020. (Photo by Kin Cheung/AP Photo)





A woman wearing a face mask to help curb the spread of the coronavirus walks on a street during the morning rush hour in Beijing, Wednesday, December 16, 2020. (Photo by Andy Wong/AP Photo)





Bamboo rafting along the Yulong River in Yangshuo, China on December 16, 2020. (Photo by Sipa Asia/Rex Features/Shutterstock)





Aerial view of buildings shrouded in fog on December 10, 2020 in Xiangyang, Hubei Province of China. (Photo by Li Fuhua/VCG via Getty Images)





People wearing face masks to help curb the spread of the coronavirus walk by trees along a street in Beijing, Monday, December 14, 2020. (Photo by Andy Wong/AP Photo)





A woman wearing a face mask takes a picture of a display at a Christmas market in a shopping mall following an outbreak of the coronavirus disease (COVID-19) in Beijing, China on December 16, 2020. (Photo by Thomas Peter/Reuters)





People walk at a Christmas market in a shopping mall following an outbreak of the coronavirus disease (COVID-19) in Beijing, China on December 16, 2020. (Photo by Thomas Peter/Reuters)





People walk on glowing stairs with lanterns in shape of stars over them at a Christmas market in a shopping mall following an outbreak of the coronavirus disease (COVID-19) in Beijing, China on December 16, 2020. (Photo by Thomas Peter/Reuters)





People walk at a Christmas market in a shopping mall following an outbreak of the coronavirus disease (COVID-19) in Beijing, China on December 16, 2020. (Photo by Thomas Peter/Reuters)





People dance at a nightclub, almost a year after the global outbreak of the coronavirus, in Wuhan, Hubei province, China, December 12, 2020. Nightlife in the city of 11 million people is back in full swing almost seven months after the city lifted its stringent lockdown. In scenes unimaginable in many cities around the world reeling under a resurgence of the pandemic, young Wuhan residents during a recent night out crowd-surfed, ate street food and packed the city's nightclubs as they looked to make up for lost time. (Photo by Aly Song/Reuters)





People play with toy guns outside a bar at night, almost a year after the global outbreak of the coronavirus disease (COVID-19) in Wuhan, Hubei province, China on December 11, 2020. (Photo by Aly Song/Reuters)





People wear masks as they walk in a shopping district, following an outbreak of the coronavirus disease (COVID-19) in Beijing, China, December 18, 2020. (Photo by Thomas Peter/Reuters)





Two satellites for the detection of gravitational waves are launched by a Long March-11 carrier rocket from the Xichang Satellite Launch Center in southwest China's Sichuan Province, December 10, 2020. China sent two satellites for the detection of gravitational waves into planned orbit from the Xichang Satellite Launch Center on Thursday morning. The two satellites, which compose the Gravitational Wave High-energy Electromagnetic Counterpart All-sky Monitor GECAM mission, were launched by a Long March-11 carrier rocket at 4:14 a.m. Beijing Time, according to the center. (Photo by Ren Hui/Xinhua via Getty Images)





People stand still on the street to pay silent tribute to the victims of the Nanjing Massacre as air-raid siren echos across Nanjing on December 13, 2020 in Nanjing, Jiangsu Province of China. China marks the seventh National Memorial Day to commemorate Nanjing Massacre Victims on Sunday. (Photo by Ni Ke/VCG via Getty Images)





People take part in a candlelight vigil in commemoration of victims of the Nanjing Massacre on the occasion of the seventh national memorial day at the Memorial Hall of the Victims of the Nanjing Massacre by Japanese Invaders in Nanjing, capital of east China's Jiangsu Province, December 13, 2020. (Photo by Li Bo/Xinhua via Getty Images)





Journalists wearing face masks to prevent the spread of the coronavirus take photos of a model of China's Chang'e 5 lunar orbiter and lander before a press conference at the State Council Information Office in Beijing, Thursday, December 17, 2020. Following the successful return of moon rocks by its Chang'e 5 robotic probe, China is preparing for future missions that could set the stage for an eventual lunar base to host human explorers. (Photo by Mark Schiefelbein/AP Photo)





A technician checks hanging clocks at a workshop of a clock company in Yantai, in eastern China's Shandong province on December 15, 2020. (Photo by AFP Photo/China Stringer Network)





A woman wearing a face mask to help curb the spread of the coronavirus walks by tree on a street during the morning rush hour in Beijing, Wednesday, December 16, 2020. (Photo by Andy Wong/AP Photo)





Children look at a model of the Longmarch rocket during an aerospace education lesson at a primary school in Yunyang county in southwestern China's Chongqing on December 16, 2020. (Photo by AFP Photo/China Stringer Network)





In this photo released by Xinhua News Agency, recovery crews look at the capsule of the Chang'e 5 probe after its successful landing at the main landing site in Siziwang district, north China's Inner Mongolia Autonomous Region on Thursday, December 17, 2020. A Chinese lunar capsule returned to Earth on Thursday with the first fresh samples of rock and debris from the moon in more than 40 years. (Photo by Peng Yuan/Xinhua via AP Photo)