Staff members disinfect the block at Sanlitun SOHO in Beijing, Feb 13, 2020. (Photo: China Daily)

A staff member disinfects a car before it enters an underground garage at Sanlitun SOHO in Beijing, Feb 13, 2020. (Photo: China Daily)

A staff member measures the temperature of a woman at Xianyukou, Qianmen Street in Beijing, Feb 13, 2020. (Photo: China Daily)

People's Liberation Army soldiers patrol Tiananmen Square in Beijing, Jan 31, 2020.(Photo: China Daily)

Sanitation workers clean the road at Tiananmen Square in Beijing, Jan 31, 2020.(Photo: China Daily)

Cleaning workers disinfect a platform at China World Mall in Beijing, Feb 12, 2020. (Photo: China Daily)

Staff members disinfect a road outside the National Stadium in Beijing, Feb 14, 2020. (Photo: China Daily)

A police officer takes the temperatures of passengers at the Baimiao checkpoint in Beijing, Feb 15, 2020. (Photo: China Daily)

Police officers take the temperatures of passengers at the Baimiao checkpoint in Beijing, Feb 15, 2020. (Photo: China Daily)

Staff members clear a walkway of snow at Jingshan Park in Beijing, Feb 15, 2020.(Photo: China Daily)

A few people are seen in front of the ticket office at Jingshan Park in Beijing, Feb 15, 2020.(Photo: China Daily)

Few people are seen at Dashilar, Qianmen Street in Beijing, Feb 7, 2020. (Photo: China Daily)

A few people are seen in the Long Corridor at the Summer Palace in Beijing, Feb 14, 2020. (Photo: China Daily)

Few people are seen in the Long Corridor at the Summer Palace in Beijing, Feb 14, 2020. (Photo: China Daily)

A staff member clears rainwater and snow from the front of the Hall of Happiness and Longevity (Leshoutang) at the Summer Palace in Beijing, Feb 14, 2020. (Photo: China Daily)

Police officers patrol the square at Beijing Railway Station, Feb 16, 2020. (Photo: China Daily)