You are learning the backhand topspin and backspin serves.
你在学习发反手上旋球和下旋球。
A similar effect occurs with golf balls, which always have "backspin" from impact with the slanted club face.
球棒斜面打击高尔夫球时，常发生“后旋”，就是这种类似效应。
The most important styles to embrace are loopers (maximum topspin), attackers (maximum speed), and choppers (maximum backspin).
最重要的风格包括弧圈型(最大上旋)，进攻型(最大速度)，和削球型(最大下旋)。
Basis shots include the backhand and forehand chops the backhand and forehand drives the backspin chop the loop the block shot the drop shot the smash the cross shot and the half volley.
基本打法包括：反手和正手削球、反手和正手抽球、削下旋球、弧圈球、推挡、吊球、扣杀、斜线球和快拨。
忍者的回旋？
Basic shots include the backhand and forehand chops the backhand and forehand drives the backspin chop the block shot the drop shot the smash the cross shot and the half volley.
基本打法包括：反手和正手削球，反手和正手抽球，削下旋球，推挡，吊球，扣杀，斜线球和快拨。
Basic shots include the backhand and forehand chops the backhand and forehand drives the backspin chop the block shot the drop shot the smash the cross shot and the half volley.
基本打法包括：反手和正手削球，反手和正手抽球，削下旋球，推挡，吊球，扣杀，斜线球和快拨。
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