2. About the source of beginning of winter, it first appeared in the classics of twenty-four solar term, which said: "Li, Jian Shi also." He also said: "Winter is the end, and everything is collected." It means that at the beginning of winter, all crops have been harvested and stored, which not only represents the coming of winter, but also represents the end of crops and the hibernation of animals.

3. Since beginning of winter season is the season of crop harvest and animal hibernation, it also means that the plants and trees in winter have withered, and everything has entered a state of hibernation, waiting for the arrival of spring, and then generate is full of vitality again.