From the ensuing rebellion came limited constitutional representative government and ultimately our modern form of democracy.

从接踵而来的反抗运动到,受限制的代议制宪政政府,最终到我们现代的民主社会

耶鲁公开课 - 古希腊历史简介课程节选

That means, it can only be rattling around in a circle of radius R.

也就是说它只能,限制在一个半径为 R 的圆上运动

耶鲁公开课 - 基础物理课程节选