And so we can use the spin rate, the rotation rate of a star, as a clock to measure its age.
因此，我们可以用星星的自转速度及速率作为衡量它们年龄的计时器。
Since Earth’s rotation rate varies, so would the value of one second when it’s defined as a fraction of the time it takes for one spin of the Earth on its axis.
由于地球自转速率发生偏离，因此当把地球绕中轴旋转一圈作为一个单位时，（这种偏离）就相当于一秒钟时间。
Forearm muscle speed and strength training can serve to improve the success rate of rotation and increase the spin of the ball.
前臂肌肉的速度力量的训练，能够提高旋转发球速度、成功率和增加球的旋转。
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