Sanitation workers clear snow from a street in Hegang City, northeast China's Heilongjiang Province, Nov. 22, 2021. Heavy snowfall hit many parts of Heilongjiang recently. Staff members of various sectors are braving frigid gusts and snowflakes to ensure normal availability of essential public services. (Photo: Xinhua)

A police officer directs traffic in the snow in Harbin City, northeast China's Heilongjiang Province, Nov. 22, 2021. Heavy snowfall hit many parts of Heilongjiang recently. Staff members of various sectors are braving frigid gusts and snowflakes to ensure normal availability of essential public services. (Photo: Xinhua)

A courier rides on a snow-covered street in Hegang City, northeast China's Heilongjiang Province, Nov. 22, 2021. Heavy snowfall hit many parts of Heilongjiang recently. Staff members of various sectors are braving frigid gusts and snowflakes to ensure normal availability of essential public services. (Photo: Xinhua)

Sanitation workers clear snow from a street in Harbin City, northeast China's Heilongjiang Province, Nov. 22, 2021. Heavy snowfall hit many parts of Heilongjiang recently. Staff members of various sectors are braving frigid gusts and snowflakes to ensure normal availability of essential public services. (Photo: Xinhua)

Workers of a mining company removes snow from railway tracks in Jixi City, northeast China's Heilongjiang Province, Nov. 22, 2021. Heavy snowfall hit many parts of Heilongjiang recently. Staff members of various sectors are braving frigid gusts and snowflakes to ensure normal availability of essential public services. (Photo: Xinhua)

Vehicles move amid a blizzard on a street in Hegang City, northeast China's Heilongjiang Province, Nov. 22, 2021. Heavy snowfall hit many parts of Heilongjiang recently. Staff members of various sectors are braving frigid gusts and snowflakes to ensure normal availability of essential public services. (Photo: Xinhua)

Sanitation workers clear snow from a street in Harbin City, northeast China's Heilongjiang Province, Nov. 22, 2021. Heavy snowfall hit many parts of Heilongjiang recently. Staff members of various sectors are braving frigid gusts and snowflakes to ensure normal availability of essential public services. (Photo: Xinhua)

Sanitation workers clear snow from a street in Jixi City, northeast China's Heilongjiang Province, Nov. 22, 2021. Heavy snowfall hit many parts of Heilongjiang recently. Staff members of various sectors are braving frigid gusts and snowflakes to ensure normal availability of essential public services. (Photo: Xinhua)

A worker removes snow from wind shield of a snow plow in Hegang City, northeast China's Heilongjiang Province, Nov. 22, 2021. Heavy snowfall hit many parts of Heilongjiang recently. Staff members of various sectors are braving frigid gusts and snowflakes to ensure normal availability of essential public services. (Photo: Xinhua)

Workers of a mining company removes snow from railway tracks in Jixi City, northeast China's Heilongjiang Province, Nov. 22, 2021. Heavy snowfall hit many parts of Heilongjiang recently. Staff members of various sectors are braving frigid gusts and snowflakes to ensure normal availability of essential public services. (Photo: Xinhua)

Sanitation workers clear snow from a street in Hegang City, northeast China's Heilongjiang Province, Nov. 22, 2021. Heavy snowfall hit many parts of Heilongjiang recently. Staff members of various sectors are braving frigid gusts and snowflakes to ensure normal availability of essential public services. (Photo: Xinhua)

A police officer directs traffic in the snow in Harbin City, northeast China's Heilongjiang Province, Nov. 22, 2021. Heavy snowfall hit many parts of Heilongjiang recently. Staff members of various sectors are braving frigid gusts and snowflakes to ensure normal availability of essential public services. (Photo: Xinhua)