What does "Long Mai" mean in Feng Shui?

Hello, Feng Shui calls the undulating geography (mainly but not limited to mountains) Long Mai. It is common in mountainous areas, and the ancient geomantic omen first promoted the "five skills of the earth", namely dragon, cave, sand, water and direction. The corresponding activities are "dragon hunting, sand inspection, water viewing, acupoint pressing and standing still". Dragon is the geographical context, soil is the meat of dragon, stone is the bone of dragon, and vegetation is the hair of dragon. Looking for dragons, we must first find the mountains of ancestors and parents, judge the pulse, don't be angry, and divide yin and yang. The plain is hard to see.