In this paper, we attempt to discuss the conditions of closed orbit in more general -cases on the basis of the method of action-angle variables in analytical mechanics.
本文试图采用分析力学中作用角变量的方法，对一般情形下的轨道闭合条件进行讨论。
On the basis of the method of action-angle variables the conditions of closed orbits under the action of general power-type gravitation potential are discussed on this paper.
本文采用作用角变量的方法，讨论了闭合轨道在一般幂次型引力势作用下的情况。
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