How to explain how dragons protect sand in Feng Shui?

Longshan reloaded, opened the screen and listed the accounts, and the mausoleum was negative. Left and right sand protection, arch enclosing, diversion, wind hiding and scenery gathering. There seem to be several recent cases, and the distant dynasty seems to be a minister, so that the buildings are far from each other and echo each other from afar. When the conditions of natural mountains and rivers are not perfect, they should be repaired, supplemented, filled and dug manually, and the nature and humanity should be organically combined to create an ideal "artificial" geomantic place.