Photo taken on Dec. 18, 2021 shows staff maintaining oil and gas pipelines in north China's Hebei Province. As winter deepens, oil transport companies increased the frequency of patrol inspection to avoid potential risks and ensure safe gathering and transportation of oil. (Liu Mancang/Guangming Picture)

Photo taken on Dec. 18, 2021 shows staff maintaining oil and gas pipelines in north China's Hebei Province. As winter deepens, oil transport companies increased the frequency of patrol inspection to avoid potential risks and ensure safe gathering and transportation of oil. (Liu Mancang/Guangming Picture)

Photo taken on Dec. 18, 2021 shows staff maintaining oil and gas pipelines in north China's Hebei Province. As winter deepens, oil transport companies increased the frequency of patrol inspection to avoid potential risks and ensure safe gathering and transportation of oil. (Liu Mancang/Guangming Picture)

来源：GMW.cn