Ironically, that lack of spin on the ball causes its path to curve because of aerodynamics.

具有讽刺意味的是，这种失去旋转的球，由于受到空气动力学方面的影响，会使球从正常的轨迹中发生偏离。

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The sharp break that sluggers see as a curveball reaches the plate springs from our brains overinterpreting the spin on the ball, visual experts say.

重击手看的锋利的断裂，当弧线球到达从我们的overinterpreting在球的脑子的板簧旋转，视觉专家说。

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This study showed that an increase in the coefficient of friction between the ball and the foot caused the ball to acquire more spin.

这项研究表明，脚和球之间的摩擦系数的增加导致了球获得更多的角动能。

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Ms. KATE BUSH: (Singing) I love the way that you spin the ball.

NPR: Kate Bush Returns with 'Aerial'

Research by the USGA has shown that U-shaped grooves allow top players to generate much more spin when playing the ball out of the rough, making the ball come to a quick stop on the green.

CNN: Woods backs golf's 'groovy' rule change

These are relatively small pieces of the earth's crust that, when caught between two larger plates, spin around as the larger plates move like a ball-bearing caught between two surfaces.

ECONOMIST: Geophysics