What is the concave wind in the tomb geomantic omen?

Also known as Teng Louxue, defeated but not hidden. Refers to the cave field where Luo Chengyuan Bureau has defects and is hit by external wind, but the gas is scattered. Feng shui experts believe that anger dissipates when the wind blows. Therefore, around the cave site, the dragons and tigers are happy with ghosts and gods, the copywriters welcome guests, and the sand of the tooth flag guards must be carefully wrapped, and there can be no vacancies, so that the five elements can be gathered inside. If there is a vacancy, the wind will sweep away the cave hall, and the anger will disappear, and the burial will only ruin the corpse. Guo Pu's Buried Sutra: "The hidden gas can disperse gas, so the dragon and tiger guard the points in the area. Overlapping in the mound, the left is empty and the right is missing, and the front is missing, and the anger is scattered in the wind. " Jingyue: The cave of the humble is the hiding place of the defeated. Note: "The qi of heaven and earth is the wind, which can disperse life most, so it is necessary to pass through the points in the front, back, left and right health care areas before touching the knot." If there are hills on the first floor of the hall, the left is empty and the right is missing, the front is open and the back is missing, and the ground melts and the wind is scattered, then anger cannot accumulate. Floating air rises at the top, sinks at the bottom and leaks at the bottom. Burial is not conducive to survival, but it is corrupt enough. "