Feng Shui terms. "Tianwen Yaolu" records refer to the sunken area between the acupuncture point and the "backing" behind it. The soil in this place is hard, barren, and windy. This place is not suitable for living. If the soil here is shoveled, it will appear like blood. It is a place of great danger. If it is used as a cemetery, the descendants of the buried person can become prosperous and prosperous for three generations, but the buried person will become a living ghost, which is what the people call "fraudulent corpses" and "zongzi". If the birthday of a living person is used to add seals to the seal book here, those born from March to May of the lunar calendar need to add three seals: "Fusang Umbrella Banner, Ji Gubing Yao, Mountain Qi Banner".