Topspin or overspin is when the ball is spinning over itself in the direction moving forward.
许多球选手对于落地回击上旋球有误会. 着简略地阐明一下.
Topspin or overspin is when the ball is spinning over itself in the direction moving forward.
许多球选手对于落地回击上旋球有误会. 着简略地阐明一下.
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