| 摘要 |
The tennis serving toss aid is a ring which is held in the fingers of the tennis ball tossing hand. The ball to be served rests freely in the ring and against the hand. The tennis serving toss aid positions the fingers for correct tennis ball tossing for serving, and helps to train the user in both the proper procedures for tossing the ball and also the avoidance of the common mistakes and improper procedures for doing so.
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