Uranus is circled by a blue ring - a colour that makes it almost unique among planetary rings, which are usually red.
行星光环通常为红色，这使得天王星的蓝色光环显得独树一帜。
Work on Uranian rings and some general problems of the planetary rings including the collision process in the rings, the photometric theory and their origin are also elucidated.
F环。还评述了天王星环以及行星环中的碰撞、光度理论和起源等问题的研究。
Secondly, the forces of inner cam rings, planetary bearings, counter weights and input shaft are solved after the acting force between the cam and the rollers has been calculated.
其次，本文在确定了凸轮-针轮副的啮合力的基础上，对整个机构的内齿板、行星轴承、配重及其输入轴进行了受力分析。
Secondly, the forces of inner cam rings, planetary bearings, counter weights and input shaft are solved after the acting force between the cam and the rollers has been calculated.
其次，本文在确定了凸轮-针轮副的啮合力的基础上，对整个机构的内齿板、行星轴承、配重及其输入轴进行了受力分析。
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