"Bala in the twelfth lunar month, freezing to death in western Western jackdaw" is a folk proverb in China, which vividly reflects the phenomenon of sudden drop and severe cold in the northern region in the twelfth lunar month, and also warns people to pay attention to keeping warm and keeping out the cold in winter to prevent their bodies from catching cold. In traditional culture, this is usually used to describe the cold degree of the weather around the winter solstice.