Imagine it like this: If you spin something, the direction of the axis tends to wobble.
这样想一下：如果你旋转什么东西，这个轴的方向将会变化。
For example, you can try to measure how hard it is to spin this sheet of paper about an axis that is in the center of it.
比如，试着让一张纸绕其中心轴旋转，看看有多困难。
For the sake of his life, Galileo recanted his views in 1633, admitting that the earth did not spin on its own axis.
为了保住性命，1633年，伽利略被迫宣布放弃日心说，承认地球并不是绕着地轴旋转的。
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。
Its spin "axis" can point in one of two directions, thereby encoding a bit, and can flip over, thereby performing a simple computational operation.
粒子的自旋“轴”会指向两个方向之一，因而记录一个位元资讯，也可借由翻转而执行一个简单的运算操作。
A simple proof of six invariants under the transformation of spin axis is put forward.
给出了二次曲面在转轴变换下的六个不变量的简易证明。
One way to think about it, if we want to use a classical analogy, which often helps to give us an idea of what's going on, is the spin of an electron, we can picture it rotating on its own axis.
如果我们用一个，经典的比喻来考虑它的话，这经常会帮助我们建立起一些概念，就是我们可以把电子的，自旋想象是它绕着轴自转。
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。
Careful observations should also detect other relativistic effects, including the precession of the pulsar's own rotational axis due to the effect of the pulsar's spin on the surrounding space-time.
仔细的观测还应该能发现其他有关相对论的影响，如由于脉冲星自转对周围空间—时间环境的影响而造成的对自转轴摆动的影响。
Careful observations should also detect other relativistic effects, including the precession of the pulsar's own rotational axis due to the effect of the pulsar's spin on the surrounding space-time.
仔细的观测还应该能发现其他有关相对论的影响，如由于脉冲星自转对周围空间—时间环境的影响而造成的对自转轴摆动的影响。
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