For example, when the police catch a suspect, when the police question him, he will unconsciously cross his fingers and try to defend himself. This action shows his guilty conscience and self-confidence. With the constant change of the police offensive, the strength of his fingers will also change. In life, when we find someone doing this action, it often means that the other person lacks confidence and needs our help. At this time, we can say something encouraging to restore his confidence or help him directly.