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。
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。
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。
What this means for a football is that a slow-moving ball with a lot of spin will have a larger sideways force than a fast-moving ball with the same spin.
对足球来说，一个转速很高但球速慢的足球将比转速相同的快速球得到更大的侧向力。
A stroke that lands above the center of a ball, as in golf or tennis, giving it a forward spin.
上部击球是击在球中心以上的抽球，从而使球向前旋转，这种手法常用在高尔夫或网球中。
Make sure that you are skimming the edge of the ball, rather than hitting towards the center of the ball. The closer to the edge contact is made, the more spin you will generate.
发旋转秋的关键是要球拍擦过乒乓球的边缘部分，而不是结结实实的打在乒乓球的中心。
I usually bowl with an eight ball. I like the control of a light ball. I can spin it more, so that the ball hooks. Then I can put it just where I want it when I bowl.
我通常打八号球，轻的 球容易控制，我可以更强劲旋转，这样球会走出弧形，然后我就能在打 球时随心所欲的控制它。
I usually bowl with an eight ball. I like the control of a light ball. I can spin it more, so that the ball hooks. Then I can put it just where I want it when I bowl.
我通常打八号球，轻的 球容易控制，我可以更强劲旋转，这样球会走出弧形，然后我就能在打 球时随心所欲的控制它。
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