在分析行星轮与内齿环各段啮合情况的基础上，建立了行星齿环换向机构中系杆的角速度和角加速度计算模型。
Based on the meshing analysis of planetary gear and inner gear-ring, the angular velocity and angular acceleration calculation model of the rod is established.
未来行星颗学家会持续研究春分点前后的影像，进而了解这个太阳系内拥有最大行星环的行星，动力成因与粒子分布特征。
Planetary scientists will be studying ring images taken near equinox to help better understand the dynamics and particle size distribution of the Solar system's most extensive ring system.
土星可算是太阳系中较为奇特的一颗行星，在望远镜中看来，它的外表犹如一顶草帽，在圆球形的星体周围有一圈很宽的“帽沿”，这就是土星光环，又称土星环。
In 1610, the year after Galileo first turned a telescope to the sky; he became the very first person to observe Saturn's rings, though he could not see them well enough to discern their true nature.
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