(Human body structure and social environment determine people's physiological functions and psychological activities, which affect the external performance and behavior of human body. Therefore, we can sum up some types according to certain statistical laws from these various phenomena of external representation and activity behavior, and infer and analyze the relationship between each type and people's physiological and psychological activities, so as to understand people's internal activity state. This is also where the ancient "face theory" has a certain basis. Therefore, we can "read" people's inner activities to a certain extent through the performance of the head.)
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