... 发不转球：knuckle service; serve without spin 发上旋球：topspin service 发下旋球：backspin service ...
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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。
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