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。

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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。

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From 12 feet, you'll throw a full-spin rotation. Grab the knife by the handle, as you would a hammer, but keep your thumb along the top edge for stability and to prevent over-rotation.

你得从12英尺外让刀旋转着飞出去，所以你要像握锤子一样握住刀把，并且让拇指顺着刀刃的方向以保持平衡、防止刀转过头。

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When we have just a single bond in them molecule, you have all the free rotation you want, you can just spin it around, there's nothing keeping it in place.

当我们在分子力只有一个单键时，你可以随意旋转，你可以让它转起来，没有什么东西能固定住它。

麻省理工公开课 - 化学原理课程节选

An ever-changing rotation of DJs spin tunes a different style on each floor into the early hours of the morning.

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There are so few air particles to create drag that a slow rotation can quickly accelerate into an uncontrollable spin.

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