La is the name of "offering sacrifices" to ancestors and hundreds of gods in ancient times. According to legend, "beginning of winter offered sacrifices to hundreds of gods three times", that is, every day after beginning of winter, when the earthly branches contained "sacrifices", the Northern and Southern Dynasties were fixed on the eighth day of December, and the Han people had to slaughter animals and hold big sacrifices. This memorial ceremony is called "hunting sacrifice" because ".