1, the commentator must do his homework in advance and know which players his opponent is and which players are playing in what position. In addition, there will definitely be some understanding of the player's appearance.

2. In the general explanation process, one stop will be hand-painted before the game to determine the basic formation. In most cases, the station provided by the official signal shall prevail. Then it is possible to predict the confrontation in a certain area in the explanation, such as left, right, front, middle and back. Very responsibly, the goalkeeper is the best to identify.

Finally, it is to broadcast the signal with pictures, look at the numbers, or feature it, or play it back after a wonderful attack, and then accurately distinguish it.