... · 变速球[IR Low Speed Dome] · 中速球[IR Mid Speed Dome] · 高速球[IR High Speed Dome] ...
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你已经有稳定的击球动作，包括正、反手能对中速球有良好的方向和深度控制。
You have dependable strokes, including directional control and depth on both forehand and backhand sides on moderate-paced shots.
当球在空中速度减慢时，周围的气流从湍流变为稳定的层流。
As a soccer ball slows down after it's kicked in the air, the air flow around it changes from turbulent to smooth.
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