A tennis ball is a small, hollow, ball used in the sport of tennis. It is made of a rubber core covered with a layer of felt, usually in a bright yellow color, which helps players see the ball more easily. It is designed to bounce well on the tennis court, providing players with control during rallies. Tennis balls are pressurized to give them a consistent bounce and speed, but they lose pressure over time, making them less effective for play. The main goal in tennis is to hit the ball over the net into the opponent's side of the court without letting it bounce twice.

英語での「tennis ball」の定義と意味

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