上个月，在土星轨道上的宇宙飞船卡西尼号拍的这张照片，捕捉到土星著名的卫星中的两个，呈凸圆相位。
A view with two of the more famous moons of Saturn in gibbous phase was captured last month by the robot spacecraft Cassini now orbiting Saturn.
这一结果支持了目前无线电掩星定性误差估计研究中通常引入卫星圆轨道假设这个近似处理方法的合理性；
On one hand, this result supports those researchers who are engaged in qualitative error sources analyses are liable to employ circular orbit assumptions;
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