Using the second order perturbation theory, the formulae of vibrational force constants are derived in part one.

运用二阶微扰理论，本文第一部分首先计算了高阶力常数的表达式。

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Simple form unretarted orbit of space vehicles under the first order perturbation of the oblateness of the earth is obtained in this paper.

本文求得了空间飞行器在地球扁率摄动作用下简单形式的一阶解。

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In order to discuss the stability of these solutions, a perturbation must be add to these solutions, and the evolution of the perturbation should be analysed.

为了讨论这些解的稳定性，必须在这些解的基础上叠加一个小扰动，并分析小扰动的演化。

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