Firefighters from Huzhong District participate in physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather. (Photos: Xinhua)

Firefighters from Huzhong District salute during physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

Firefighters from Huzhong District participate in physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

A firefighter from Huzhong District participates in physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

Firefighters from Huzhong District participate in physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

Firefighters from Huzhong District participate in physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

Firefighters from Huzhong District participate in physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

A firefighter from Huzhong District salutes during physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

A firefighter from Huzhong District participates in physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

Firefighters from Huzhong District participate in physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

A firefighter from Huzhong District salutes during physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

Firefighters from Huzhong District participate in physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

Firefighters from Huzhong District participate in physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

Firefighters from Huzhong District participate in physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

Firefighters from Huzhong District salute during physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

A firefighter from Huzhong District salutes during physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

Firefighters from Huzhong District participate in physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

A firefighter from Huzhong District salutes during physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

Firefighters from Huzhong District participate in physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

Firefighters from Huzhong District participate in physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

Firefighters from Huzhong District participate in physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.

Firefighters from Huzhong District salute during physical training in Dahinggan, northeast China's Heilongjiang Province, Jan. 10, 2021. Known as "China's coldest town," the Huzhong District in recent days has seen its temperature reach as low as minus 40 degrees Celsius, The firefighers here still stick to a physical training despite the freezing weather.