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- The orbit period depends on the altitude of the satellite. 卫星的轨道周期取决于其高度。
- With Callisto's orbital period of about half a month, the entire sequence could take less than a year. 由于木卫四绕木星公转的轨道周期约为半个月，整个过程只需不到一年。
- All the published moments of light minima of the near contact binary BF Vir have been compiled and the changes of orbital period have been analyzed. 收集了近相接双星BF Vir 的光极小时刻;并对其轨道周期进行分析.
- Telstar I was an 87-cm,80-kg sphere placed in low-Earth orbit between 960 and 5140 km,with an orbital period of 158 min. 通讯卫星1号是87厘米;80千克的球体;放置在960到5140千米的近地轨道上;轨道周期为158分钟.
- Simulation design is carried out according to the C-band small satellites formation, in one orbit period, the variation of interferometric baseline and the elevation precision are presented. 并基于C波段编队小卫星进行了仿真设计,给出了在一个轨道周期内,干涉基线的变化情况和测高精度变化的仿真结果。
- Despite the Moon's rotational and orbital periods being exactly locked, we may actually observe about59% of the moon's total surface with repeated observations from earth due to the phenomena of librations and parallax. 尽管完全地被锁的月亮的回转而轨道的期数，我们由于振动和视差的现象可能实际上用来自地球的重复的观察观察大约59%25月亮的完全表面。
- The numerical computation for the secular variable of the semi-major axis, solar distance at perihelion, orbital periods and longitude of perihelion has been made for fifteen meteor streams by using the solution of Gylden-Meshcherckii equations. 利用G-M型变质量天体轨道根数变化方程的一阶和二阶解对15个流星群轨道半长轴、近日点距离、轨道周期和近日点经度因太阳质量损失造成的每世纪的长期改变效应做了数值计算，并得出计算结果。
- "The analysis of all the stars studied with HARPS shows that about one third of all solar-like stars have either super-Earth or Neptune-like planets with orbital periods shorter than 50 days. “分析使用HARPS研究的恒星，偶们会发现大约有三分之一的类似太阳的恒星都有超级地球或者类海王星行星绕着自己转，而且公转周期还都小于50天。”
- That period was a bright page in the history of Chinese literature. 那个时期是中国文学史上光辉的一页。
- Let us hope that the period of this injustice will be over soon. 让我们希望这个不公正的时期很快结束吧。
- The spacecraft is in orbit around the moon. 该航天器在绕月球轨道运行。
- Childhood is a period of rapid growth. 幼年是生长迅速的时期。
- Two bodies share such a zone if their orbits ever cross each other, if their orbital periods differ by less than a factor of 10, and if they are not in a stable resonance. 当两个天体的轨道互相交错、轨道周期相差不到10倍，并且不是处于稳定的共振状态，那麽两者就是共有一个轨道区域。
- He consulted the chronicles of the period. 他参考了这一时期的编年史。
- The space shuttle will orbit a weather satellite. 太空梭将把一个气象卫星送入运行轨道。
- The launch vehicle lifts the satellite into orbit. 太空火箭将人造卫星送入运行轨道。
- He had to decide within a given period. 他得在一定时间内作出决定。
- She has a detailed knowledge of this period. 她对这段时期的情况了解地相当详细。
- In that period auto sales hit a14-year low. 这时期汽车销售量达到14年来最低水平。
- In this period, unemployment reaches record levels. 这段时间的失业人数又达到了创纪录水平。
