Why do you know you're scared just by looking at the tiger's mouth?

The tiger's mouth is located at the tiger's mouth at the root of the index finger. When people are frightened or nervous, they will unconsciously clench their fists, and when they clench their fists, most of them will choose to hide their thumbs under the other four fingers. So there is enough space for blood to flow through the tiger's mouth at the root of the index finger. When blood flows through the tiger's mouth, it will form a series of blood columns. After these blood columns are scanned by the machine, they will be converted into digital signals and transmitted to the computer. After computer processing, it will form tiger's mouth with different shapes and colors. Therefore, it can be seen that escaping from the jaws of death is only a physiological manifestation of psychological stress, which is closely related to fear and tension.