This substantially increased the drag on the ball, which made it slow down even more.
这大幅增加了球的阻力，使它减速更甚。
Practice this at home in slow motion without a ball.
在家无球练习上述九重打法。
More backspin will slow the ball down and let it drop into the court.
更多的回旋会减球速，使它掉进场内。
More backspin will slow the ball down and let it drop into the court.
更多的回旋会减球速，使它掉进场内。
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