(do you know? As soon as you open your mouth, the opponent can decide whether to overtake you within 0.5 seconds. I am not exaggerating. A joint study by psychologists at the University of Glasgow and Princeton University found that in a conversation, it only takes 0.5 seconds. Make subjective judgments about the trustworthiness of the other party. That is to say, when you open your mouth, you reveal who you are and whether you can win the other party in the process of interacting with others. In this era of efficiency, being able to speak determines the efficiency of your life.)