Ding Lu ① health terms. It turned out that the foreign Dan family came to alchemy. Later, it was borrowed by the Neidan family, taking the human body as the cauldron of Dan Gong. There are also large and small cauldrons. (2) Ding Yu. Also known as tripod, tripod, jade tripod, medicine tripod, furnace, etc. See Ming Hongji's "Secret Dissection of Living Species" volume and furnace tripod placement. Cauldron originally meant ancient medicine alchemy and cooking utensils. In ancient times, the health-preserving family in the house called the woman the furnace tripod, and practiced qigong guidance and tonic techniques in the house to refine her inner elixir and pray for a long life. It is considered that choosing a good cauldron is of great benefit to qigong practice. "Secret Anatomy of Photographing Seeds": "Those who cook a cauldron can choose Yin people over 15 or 16 years old, with fine eyes, red teeth, smooth skin, clear voice and fluent language. They are all good utensils." This belongs to feudal dross and should be criticized. But it also reveals some external manifestations of women's health.