1·Under the control of the Sun's gravitational force, each planet maintains an elliptical orbit and all of them travel in the same direction.
在太阳引力的控制下，每个行星都维持在一条椭圆形的轨道上，并按照相同的方向移动。
2·There is a gravitational force.
有一个重力作用。
3·the force, gravitational force, falls off as one over r squared.
,力，重力，随着r的平方而减少。
4·And now we're going to multiply that by the gravitational force constant.
我们现在把这个结果，和重力常量相乘。
5·mg There's a gravitational force, which is mg, but there is also tension.
存在重力也就是，但是还存在张力。
6·A heavenly body kept in orbit around a planet by gravitational force.
一种因引力而沿轨道绕行星旋转的天体。
7·If they are three units apart the gravitational force between is one ninth.
如果有三个单位的距离，那么引力就是九分之一。
8·Newton's law of gravity; Gravitational force from a shell; Hooke's 'law'.
克普勒圆周轨道第三定律；利用积分推导球壳的引力；弹簧。
9·This strong connection is like a gravitational force on a higher dimension.
这种强烈的关系，就好像更高维次里的万有引力。
10·So if we apply that concept, then we first have to know what is the gravitational force.
如果我们运用这概念，我们必须先知道，引力是什么。