How much yang fire is there on people? What are three? What will happen if they are put out?

There is a folk saying that ghosts blow lights: It is said that a person has three oil lamps, one on his head and the other two on his shoulders. It is said that the sun shines fire on people. When walking at night, if someone calls your name, don't look both ways. If it is blown out, it will give the ghost a soul. Although "ghost blows light" is a folk saying, there are many people who play this trick in real life. A ghost blowing a lamp means trick, cleverness, etc. It is said that you need to light a lamp when robbing a tomb. If the ghost won't let you rob the tomb, blow out the light. This is an agreement between the living and the dead. In modern scientific terms, it is to light a lamp to see if there is enough oxygen. If it's not enough, you'll die if you go down. The ancients didn't understand and thought it was a ghost.