earth dynamic ellipticity

例句：

1. 1.The study of the earth's dynamicsellipticity is crucial for understandingits rotational motion.
   研究地球的动力学椭球度对于理解其旋转运动至关重要。
2. 2.The research on the earth's dynamicsellipticity has led to significantadvancements in satellite navigation technology.
   关于地球动力学椭球度的研究已经导致卫星导航技术的重大进步。
3. 3. The earth's dynamicsellipticity plays a crucial rolein determining its rotational speed and direction.
   地球的动力学椭球度在确定其旋转速度和方向方面起着关键作用。