People often call tennis a noble sport, a fashionable sport, and an elegant sport. In fact, the elegance of tennis is not only due to the elegant and beautiful clothing of the players, nor to the expensive equipment, nor to the expensive court rental fees of indoor arenas. Anyone who plays tennis regularly knows that there are many unwritten rules in tennis. When practicing ball, we have to pick up our own balls and we must help pick up the balls of others nearby. When someone picks up the ball for you, you must say "thank you" to them. Although everyone plays together every day, and although others help you pick up the tennis balls countless times every day, you still naturally say "thank you". During a game, when our opponent hits a beautiful and difficult return shot, most of us will gently hit the racket to express our appreciation, which is very rare in other sports. When a ball you hit rolls into the net and scores, you will sincerely apologize to the opponent. Amateur tennis, whether it is a formal game or a recreational game, is mostly doubles. During the game, we applaud our teammates for their good shots. He will also take responsibility for not handling the ball well. Tennis teaches you politeness, kindness, patience, calmness, and how to behave.