Kim: Saliva. Body fluid is saliva secreted in the mouth. In traditional health care in China, saliva is extremely precious and has the reputation of life-prolonging syrup. As far as medical knowledge is concerned, saliva contains many beneficial components, especially in promoting digestion and enhancing nutrient absorption. On the one hand, it can quench thirst, on the other hand, it can nourish life. A healthy and energetic person has a lot of saliva in his mouth. I always feel thirsty and my throat is tight. There must be something wrong with my health. Drinking tea soup can not only moisten the throat rhyme, nourish the mouth and life, but also provide a spiritual and artistic environment for drinking tea. Pu 'er tea is a kind of big leaf tea with rich connotation and strong function of promoting fluid production. One of the main characteristics of Pu 'er tea is the production of body fluid.