那些色彩在一张圆盘上旋转，并被反射到后面的墙上。
The colours rotated around on a disc and were reflected onto the wall behind.
它看起来像一个巨大的圆盘。
第二个问题是，当金星在太阳圆盘外被观测到时，它会呈现出光晕。
The second problem is that Venus exhibits a halo of light when it is seen just outside the Sun's disc.
他意识到，从不同的纬度上看，行星穿过太阳圆盘的路径似乎会不一样。
He realized that, from different latitudes, the passage of the planet across the Sun's disc would appear to differ.
行星被认为是由围绕恒星旋转的气体和尘埃组成的圆盘中的粒子累积而成。
Planets are believed to emerge from the accretion of particles in a disk of gas and dust as they whirl around the star.
这种以每秒数百公里的速度旋转的运动，可能会使圆盘上的物质呈现出螺旋形状。
This spinning motion, at speeds of hundreds of kilometers per second, may cause matter in the disk to take on a spiral shape.
当第一次用望远镜观测到火星时，人们从飞机上看到，火星的圆盘在地球上纵横交错。
When the planet Mars was first observed through a telescope, people saw that the round disk of the planet was crisscrossed on earth that are viewed from an airplane.
当第一次用望远镜观测到火星时，人们从飞机上看到，火星的圆形圆盘在地球上纵横交错。
When the planet Mars was first observed through a telescope, people saw that the round disk of the planet was criss-crossed on earth that are viewed from an airplane.
从一端到另一端，银河系布满星星的圆盘横跨12万光年，可以用肉眼和光学望远镜观察到。
From end to end, the Milky Way's starry disk, observable with the naked eye and through optical telescopes, spans 120,000 light-years.
当金星开始穿过太阳的圆盘时，它看起来有斑点，不是圆形的——这使得确定时间变得困难。
When Venus begins to cross the Sun's disc, it looks smeared not circular—which makes it difficult to establish timings.
圆盘产生自己的引力拖曳，这种相互作用的力夺走了行 星在其轨道上的动量，迫使它盘旋向恒星的方向。
The disk exerts its own gravitational tug, and this interplay of forces robs the planet of momentum in its orbital path, forcing it to spiral in toward the star.
圆盘似的月亮会高悬在夜空中，将柔和的月光洒向世间万物。
The moon's round orb would shine high in the sky, casting its velvety light on everything.
这些圆盘是行星形成的剩余物质。
假设车里有个圆盘，半径为半米。
Suppose you had a disk in your car which had a radius of half a meter.
奖章圆盘的正面是阿拉斯泰尔·坎贝尔。
这是圆盘，我们刚讨论过,绕质心旋转。
So this is a disk, and we just discussed the rotation about the center of mass.
这些圆盘正被激活形成12个螺旋漩涡。
西卡牧师的圆盘装置已经运用了100多年了。
Father Secchi's simple disk has been used for more than 100 years.
没有圆盘，就没有行星；没有行星，就没有生命。
现在我们计算另三个的，周期：圆环，圆盘和摆。
So let's now calculate the period for the other three objects: for the ring, for the disk and for the pendulum.
就会得到一个被逆时针曲线包围的圆盘，法向量向上。
Then, if you had a flat disk with the curve going counterclockwise, the normal vector would go up.
举个例子，取一个圆心为原点的圆盘，重心应该在原点。
For example, take a disk center at the origin, well, the center of mass should be at the origin.
假设有个转动圆盘，现在给你们看它有厚度的。
Suppose we have a rotating disk, and I will make you see the disk now with depth.
可以在车内装个圆盘，可以称之为飞轮，可以转化，重力势能。
You can install a disk in your car, which I would call, then, a flywheel, And you can convert the gravitational potential energy.
当然有，你可以做一个球面，或者，只要不是这样的圆盘都行？
Yeah, I can take the sphere, you know, for example, or anything that's just not quite the disk?
在外来者眼前，西湖看起来就像是一个平放着的圆盘。
And then the lake itself is like a plate which spreads before the eyes of the outlooker.
现在要做的，就是要转化，所有这些重力势能，变成圆盘的动能。
Now, what we would like to do is we would like to convert all this gravitational potential energy into kinetic energy of that disk.
每位被测妇女都观看一个光学器件，其快速连续的显示三个小圆盘。
Each woman looks into an optical device that shows her three tiny discs in rapid succession.
星系的圆盘包含环绕星系中心以一定规律运转的恒星、卫星和气体。
The galaxy's disk includes stars, planets, dust, and gas—all of which rotate around the galactic center in a regular manner.
显然，它界定了这个圆盘，但是这个圆盘在面包圈的内部。
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