你在学习发反手上旋球和下旋球。
我擅长反手上旋球。
发球方法包括，反手上旋球和下旋球，正手上旋球和下旋球。和高抛发球。
Services include the backhand topspin and backspin serves, the forehand topspin and backspin serves, and the high toss service.
发球方法包括，反手上旋球和下旋球，正手上旋球和下旋球。和高抛发球。
Services include the backhand topspin and backspin serves the forehand topspin and backspin serves and the high toss service.
发球方法包括，反手上旋球和下旋球，正手上旋球和下旋球。和高抛发球。
Services include the backhand topspin and backspin serves the forehand topspin and backspin serves and the high toss service.
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