When watching the volleyball match on TV, we often see such a scene: while waiting for the opponent to serve, the opponent's setter or front row player makes various signals with his fingers behind his back, so the whole team understands and organizes tactics to attack the opponent according to this predetermined signal.

Practice has proved that this gesture and code word is an effective means to organize various flexible tactics such as time difference and poor position. Of course, if you don't want to use this gesture code, you can. There are no hard and fast rules. At first, teams shouted slogans to complete the purpose of organizing various offensive tactics. The Japanese women's team shouted "time difference" and "fast break" in the attack. Over time, these words were understood by clever foreign opponents and prepared early, which greatly weakened the effect of cooperating with the attack. So, instead, I make gestures and signals behind my back.

At present, most volleyball teams in the world are using this advanced and scientific signal means to organize attacks, but as for what tactics various gestures represent, this is agreed by the players of each team in advance, and outsiders cannot know it, only they know it clearly.

2. What are the requirements for the entrance ceremony of international large-scale competitions?

17 before the start of the game, the referee will call the captains of both sides to choose the right to serve and the venue. After the selection, both sides will practice in the competition venue for 5 minutes, and then all the players from both sides will stand at their respective end lines. The referee will blow the whistle to announce the exchange of team flags and souvenirs, and the players of both sides will leave after the exchange. After the exit, the referee announced that the player who serves first will enter for 5 minutes, and then the player who receives the service first will enter for 5 minutes. Introduce the names and numbers of athletes when both sides practice. After the practice (that is, 2 minutes before the official start), the referee announced that he would stop practicing. Six players from each side stood at their respective end lines, and the other players left. After the final inspection, the judges are in their positions, and the referee takes the stage to announce the start of the game.