“major radius of orbit”的概念、定义、翻译、参考文献-科学参考

单词	major radius of orbit
释义	major radius of orbit Encyclopedia 工学卫星运动方程释 major radius of orbit轨道长半径轨道椭圆长轴长度的一半，决定了卫星绕地运行的周期，轨道长半径越大卫星运行周期越长。
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