Variations of eccentricity are very important for satellites orbiting the earth,the moon or Mars. It is one of the key factors determining the lifetime of various space objects （with different orbit height）.
轨道偏心率的变化极其重要,它是制约各类(不同高度)空间飞行体轨道寿命的关键因素之一。
参考来源 - 卫星轨道偏心率的变化特征及其对轨道寿命的影响·2,447,543篇论文数据，部分数据来源于NoteExpress
中性浮力地面实验系统的实验体设计问题是有效实现空间飞行器研制阶段地面演示验证实验的关键技术之一。
The problem of the experimental object design for ground experiment system of neutral buoyancy was one of the key to achieving demonstration effectually of the development of spacecraft.
建立了有内导向瓣周边式对接机构的两空间飞行器对接过程的动力学模型，建模中将对接系统简化为主动飞行器、被动飞行器和主动捕获环三体问题。
The mathematical models of docking dynamics in the process of capture are established for two spacecrafts with inner guide petal peripheral docking mechanisms.
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