在太阳系，大多数的行星都各自拥有统一的圆周轨道。
In our solar system, planets for the most part have fairly uniform circular orbits.
克普勒圆周轨道第三定律；利用积分推导球壳的引力；弹簧。
Newton's law of gravity; Gravitational force from a shell; Hooke's 'law'.
开普勒圆周轨道第三定律；利用积分推导球壳的引力；弹簧。
Kepler's 3rd law for circular orbits; Building up the shell-force by integration; Spring gun.
根据量子力学的法则，核子外部一定数目的核外电子以一定的圆周轨道运行形成球状壳结构。
Under the laws of quantum mechanics, the nuclei of atoms have shell-like structures analogous to the spheres in which given Numbers of electrons exist in certain orbits around the nucleus.
著名的亚历山大艾伦将这个问题予以阐述，他提出太阳绕着地球转,金星则绕着地球和太阳之间轨道进行圆周运动。
well the way it was done was develop by an Alexandrian Allen , very famous , he had the sun moving around the earth and Venus orbiting around the point on the line between the earth and the sun.
我们发现月球环绕地球的轨道总是圆周形--或很近似圆周形。每一个月，或者更确切些说是每27又1/3天就环绕地球转一圈。
We find that it is traveling in a circle - or very nearly a circle - round the earth, going completely round once a month, or, more exactly, once very 27 1/3 days.
这是一个向量场，其中旋转轨道是，以z轴为圆心的圆周，并且这个向量场与每个圆相切。
That is a vector field in which the trajectories are going to be circles centered in the z-axis and our vector field is just going to be tangent to each of these circles.
这是一个向量场，其中旋转轨道是，以z轴为圆心的圆周，并且这个向量场与每个圆相切。
That is a vector field in which the trajectories are going to be circles centered in the z-axis and our vector field is just going to be tangent to each of these circles.
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