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。
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。
Due to the earth's rotation, hurricanes spin counterclockwise north of the equator and clockwise south of it.
由于地球的自转，赤道以北的飓风是逆时针旋转的，赤道以南则是顺时针。
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。
Two sources of torsion are studied macroscopic rotation and aligned spin.
挠率的两个源被研究—宏观转动和排列自旋。
We now go for the upside-down, flat spin rotation.
我们现在要开始由上到下挂线的平转。
You simply take up the slack given for the flat spin rotation and fly off.
你只需要简单地收回刚才为了平转而松出去的线，然后飞走就可以了。
This paper presents the methods of free flight spin test and rotation balance test in vertical wind tunnel, the design of test model is briefly expounded.
介绍了立式风洞自由飞尾旋试验和旋转天平试验的方法，简述了试验模型的设计。
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。
The dynamic stability derivatives which are used for analysis and prediction the characters of spin are acquired in routine flow field usually, which has no effect of rotation.
尾旋特性分析及预测时所使用的动导数通常是在常规流场中获得的，测得的动导数没有体现旋转流场的影响。
Protons have a property known as spin, a quantum physics counterpart to the more familiar, everyday kind of rotation.
质子有一个属性叫做自旋，这一量子物理量对应到我们日常生活中，就是人们更为熟悉的旋转。
Astronomers expect it to continue to spin down, eventually reaching a point when its rotation will be too slow to power the radio pulses.
天文学家预期它的自转会继续变慢，直到它慢得不足以发射无线电脉冲为止。
The rotating pendulum is a typical underactuated system with a rotating shaft of the motor attached to the end which is free to spin about an axis parallel to the axis of rotation of the pendulum.
旋转摆属于典型的欠驱动系统，通过驱动杆的水平转动可使欠驱动杆由垂直下摆位置转到竖直向上位置。
MINUSES: the rotation is not perfectly even, the nose exits short of 12:00 straight up, and a fair amount of altitude is lost in the spin.
缺点：平转不够平衡，结束时机头不到12：00垂直向上，平转的过程丢失了相当数量的高度。
MINUSES: the rotation is not perfectly even, the nose exits short of 12:00 straight up, and a fair amount of altitude is lost in the spin.
缺点：平转不够平衡，结束时机头不到12：00垂直向上，平转的过程丢失了相当数量的高度。
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