n.（指球）回旋，倒旋，下旋
Backspin - the effect of striking the cue ball below centre.
缩杆 – 击打主球球心以下的位置后所产生的结果.
Backspin: Reverse spin imparted by striking the ball with a downward movement of the racket.
下旋: 向下挥动球拍击出的旋转球,使球回转.
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