Farmers pick vegetables at a greenhouse in Longyao County, north China's Hebei Province, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Xinhua/Mu Yu)

Farmers carry vegetables at a greenhouse in Longyao County, north China's Hebei Province, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Xinhua/Mu Yu)

Staff workers of power supply company operate a drone to patrol power lines in Beijing, capital of China, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Xinhua/Li Xin)

An employee of power supply company clears snow in Benxi, northeast China's Liaoning Province, Dec. 15, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Xinhua)

Staff workers of power supply company carry out infrared temperature measurement of the main transformer in east China's Shanghai, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Xinhua/Wang Xiang)

Staff workers pump water into a train at Shanghai Hongqiao Railway Station in east China's Shanghai, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Xinhua)

Workers transport vegetables at a wholesale market in Yinchuan, northwest China's Ningxia Hui Autonomous Region, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Xinhua/Wang Peng)

Workers transport vegetables at a wholesale market in Yinchuan, northwest China's Ningxia Hui Autonomous Region, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Xinhua/Wang Peng)

Sanitation workers clear snow in the street in Shijiazhuang, north China's Hebei Province, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Photo by Chen Qibao/Xinhua)

Volunteers make dumplings for solitary and troubled elders at the Dushan Community in Linyi, east China's Shandong Province, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Photo by Wang Yanbing/Xinhua)

A driver checks his bus at a parking lot in Shangqiu, central China's Henan Province, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Photo by Li Heng/Xinhua)

Snowplows clear snow in the street in Yantai, east China's Shandong Province, Dec. 16, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Photo by Tang Ke/Xinhua)

Farmers package blanched garlic leaves in Liuxicun Township in Zunhua, north China's Hebei Province, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Photo by Liu Mancang/Xinhua)

A snowplow clears snow in the expressway in Wuwei City, northwest China's Gansu Province, Dec. 16, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Photo by Jiang Aiping/Xinhua)

Staff members clear snow in the expressway in Wuwei City, northwest China's Gansu Province, Dec. 16, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Photo by Jiang Aiping/Xinhua)

Customers visit a supermarket in Zunhua, north China's Hebei Province, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Photo by Liu Mancang/Xinhua)

Staff members of Hulun Buir Power Supply Company of State Grid East Inner Mongolia Electric Power Co., Ltd check power supply devices at a residential compound in Hulun Buir, north China's Inner Mongolia Autonomous Region, Dec. 16, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Xinhua/Bei He)

Technicians inspect the transmission lines with a drone in Hefei, east China's Anhui Province, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Xinhua/Du Yu)

A technician installs an on-line monitering device in Hefei, east China's Anhui Province, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Photo by Zheng Xianlie/Xinhua)

A police officer directs the traffic in Gulang, northwest China's Gansu Province, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Xinhua/Lang Bingbing)

Staff members operate at a centralized heating company in Wuwei City, northwest China's Gansu Province, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Xinhua/Lang Bingbing)

This aerial photo shows an LNG ship unloading at the Tianjin LNG Terminal (Sinopec) in north China's Tianjin, Dec. 16, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Photo by Wang Jun/Xinhua)

A staff member of Harbin Zhongqing Gas inspects pipelines in Harbin, northeast China's Heilongjiang Province, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Xinhua/Zhang Tao)

A staff member of Harbin Zhongqing Gas inspects pipelines in Harbin, northeast China's Heilongjiang Province, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Xinhua/Zhang Tao)

Staff members inspect pipelines at Tianjin LNG Terminal (Sinopec) in north China's Tianjin, Dec. 16, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Photo by Wang Jun/Xinhua)

This aerial photo shows staff members of Harbin Zhongqing Gas inspecting pipelines in Harbin, northeast China's Heilongjiang Province, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Xinhua/Zhang Tao)

Staff members of Harbin Zhongqing Gas inspect pipelines in Harbin, northeast China's Heilongjiang Province, Dec. 17, 2023. Countermeasures have been taken to prevent or alleviate impacts inflicted by extensive snowfall and other freezing conditions. (Xinhua/Zhang Tao)