How to explain the legend of Nian beast to children?

The legend of Nian beast can only be traced back to Sun Yusheng, a novelist and journalist in the early years of the Republic of China. On June 1933+ 10 17, he published an article "Memories of Old Things and Old Customs" in Jin Gangzuan. He said: "There are people who hang purple stars to draw axes. Every time the painter draws a stone pillar, the pillar is locked like a dog instead of a dog. As for "why Nian beast is afraid of red, fire and explosion", it probably comes from the legend of evil spirits in the mountains or the tradition of the ancients setting off firecrackers to drive away mandrills.