Science offers no plausible explanation of how it could have slowed to its current rotational rate from that speed.

科学并没有给出合理的解释，说明它是如何从那个速度减速到现在的转速的。

Earth's unique and massive satellite, the Moon, plays a crucial role in stabilizing the obliquity of Earth's rotational axis.

地球独特而巨大的卫星——月球，在稳定地球旋转轴的倾角方面发挥了关键作用。

Finally, Earth's unique and massive satellite, the Moon, plays a crucial role in stabilizing the obliquity of Earth's rotational axis.

最后，月球作为地球独特而巨大的卫星，在稳定地球旋转轴的倾角方面发挥了关键作用。

For an object to be in rotational equilibrium about a certain point, the total torque about this point must be zero.

一个物体若要在某一点处处于转动平衡，在这一点处的总力矩必须为零。

Rotational energies are small.

转动能量很小。

And that's a rotational degree of freedom.

那是一个旋转自由度。

Linear molecules, I have kT of rotational energy.

线性的分子，我有kT的转动能。

There's also rotational disorder if it's a molecule.

如果是分子也会有旋转无序。

Use Rotational Symmetry to Convey Movement and action.

使用旋转对称传达动作和行为。

Remember, torque is the rotational analog of the force.

扭矩是力转动的对应量。

Even on a static medium, rotational symmetry can convey action.

即使在一个静态的介质中，转动对称也可以表达出动态的意味。

And you say, well, OK, let's think about their rotational motion.

然后你说，好，让我们来考虑它们的转动。

Eventually, our planetary rotational change will pretty much cease.

最终，我们星球的转动速度也会几近停止。

In art and design, rotational symmetry can be used to portray motion or speed.

在艺术和设计中，转动对称可以用来表达动作和速度。

We could worry about its vibrational or rotational energy, or electronic state.

我们也需要知道，他的振动和转动能量，或者电子状态。

The average rotational latency is one-half of a revolution of the disk platter.

平均旋转等待时间指的是磁盘旋转一半的时间。

I've got this little bit of advertisement here about our rotational program.

我想给我们的轮岗项目，做个小广告。

Earth's rotational tilt varies between 0.5 and 1 degree about every 100, 000 years.

地球的旋转倾角每10万年的变化在0.5到1度之间。

Then, using vector analysis, you use rotational symmetry, and you get this next set.

但是当你使用矢量形式时，一种轮换对称的形式，你们会看到接下来这种形势。

So another way to think about that is just the rotational kinetic energy of our electron.

或者，这样想,它是，电子旋转的动能。

If I know the moment of inertia, then I know how much rotational kinetic energy there is.

若知道转动惯量我就能知道，转动动能是多少。

Geometry dictates that only two -, three -, four - and six-fold rotational symmetry can exist.

几何规定旋转对称只能以二次，三次，四次和六次存在。

In other words, ordinary thermal energies do populate some number of rotational levels of molecules.

也就是说，常温会，激发分子的一些转动能级。

Nor do the laws of nature change depending on the direction in which you look (rotational symmetry).

定律也不会因为你观察的方向不同而改变(这是转动对称性，Rotational Symmetry)。

And the rotational kinetic energy can be consumed, then, at a later time, so it's very economical.

选择动能，会在之后一段时间，被消耗，非常经济的。

To make this simple, we're going to assume that the rotational energies are the same for all the molecules.

为了让问题简单清晰一些，我们假设转动能量对于所有的分子,都一样。

Rotational symmetry (or radial symmetry) is when an object is rotated in a certain direction around a point.

旋转对称(或称放射对称)是指某一物体绕着某一点在某一方向上做转动。

That figure axis is near, but does not quite align with, the rotational axis that the Earth spins around.

这个几何中轴靠近，但的确是和地球自转中心排成一行。

That is impossible. Geometry dictates that only two-, three-, four- and sixfold rotational symmetry can exist.

然而几何学告诉我们，只有二次、三次、四次和六次的旋转对称是能够存在的形式。

One way to see this is to compare the energy of a nuclear blast to that of the rotational motion of the Earth.

有一种方法可以说清楚这个问题：即把核爆炸的能量与地球转动的能量作一次比较。