The original text of "dripping water" said: "Five dry roots are not only beautiful, but also the roots of longevity, residual qi and tomb. Such as A, B and Mu Jian, they are solid and vigorous. When they see Haichen, they also have roots. " Simply put, it refers to a word in the heavenly stems, and there are the same five-line characters in the earthly branches and Tibetan stems, so it is called heavenly stems and has roots. For example, there is a nail in the sky and a branch on the ground. Because there are nails on the ground branch, C and E, and there are nails on the ground branch, it is a root.