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We have already worked out the conditions for a circular orbit. 我们已经算出了圆轨道的条件。
It is impossible that the man-made satellite never loses its orbit velocity. 人造卫星永久保持轨道速度是不可能的。
Engineers realized that the plane would never be able to reach orbital velocity on its own. 工程师们已经认识到，这种喷气机自己永远不能达到地球轨道的速度。
Of hydrogen atom or hydrogen-like ions, the elliptic orbit, energy, orbital velocity, period and quantization are discussed in brief and perfection. 对氢原子或类氢离子中电子的椭圆轨道和能量及其量子化等给出了一个简明、完善的讨论.
The engine operated for 63 seconds. The elliptical orbit was changed to a near circular orbit. 飞船变轨,变轨发动机工作了63秒,使原来的椭圆形接近圆形。
As another example the center of mass of the earth and moon moves in an approximately circular orbit around the sun. 作为另一个例子，地球和月亮的质心就是在一个绕太阳的近似的圆轨道上运行。
The first sub-result is calculated by applying the FDK algorithm to the projection data acquired by a single circular orbit scan. 该重建算法由两部分重建结果叠加而成,第1部分结果首先采用FDK算法通过对单圆扫描的投影数据进行重建来获得;
If you are on an unstable circular orbit, then a tiny burst on your maneuvering thrusters will send you into the black hole, or off into outer space. 如果你驾驶飞船在黄色区域中运动，你的发动机哪怕只做出一点微小的喷射，都会使你掉入黑洞中，或是把你甩到外面的绿色区域中去。
The bulk of the solar system's mass is contained in the sun, and the orbital velocity of the planets decreases with distance.Mercury trundles around the sun much faster than Earth does, for example. 太阳系就是这样：太阳系的质量主要集中在太阳，行星离太阳愈远，轨道速度就愈小（如水星绕太阳的速度就比地球快多了）。
Anlysis shows that the scan field of view along the horizon can be improved no less than 80% compared with cone-beam 3D-CT based on FDK and circular orbit scan mode. 分析表明,其水平方向的有效扫描视野比基于FDK的圆轨道锥束扫描三维CT提高了80%25以上。
FDK-type three dimensional computed tomography(3D-CT) with circular orbit based on FPD can execute inspection rapidly,but its imaging quality can not reach that of 2D-CT. 基于FPD的圆轨道FDK型三维计算机层析成像技术(Computed Tomography,3D-CT)检测速度快,但成像质量不及2D-CT。
What happens to the precession rate if the orbit around a black hole is made nearly as small as possible, i.e. a slight elongation of the innermost stable circular orbit? 如果将围绕黑洞的轨道调至尽可能的小（即轻微拉长最内层的稳定圆形轨道），对岁差率有何改变？
Images taken with a ground-based Keck telescope, when combined with existing images taken by Hubble Space Telescope, show that Dysnomia has a nearly circular orbit lasting about 16 days. 地面凯克望远镜拍摄到的影像，与哈勃太空望远镜已经拍摄得到的影像结合，显示了戴丝诺米娅有一个近似圆形轨道，运行轨道一周需要16天。
Orbital velocities in spiral galaxies, instead of declining with increasing distance from the galactic center, flatten out to a constant value, as predicted by MOND. 螺旋星系中的轨道速度并不会随著离开星系中心的距离增加而不停降低，它会平缓下来成为一固定值。
This article discusses the problem of the energy about the rclativistic Bohr atom with circular orbits of clctrons. 本文讨论了相对论玻尔原子、电子具有圆轨道的能量问题,这一结果是经过仿效非相对论情况获得的。
Something of circular form; a circle or an orbit. 圆形物体圆形物体; 圆圈或环形轨道
The planets transferred their random motion to the doomed planetesimals and entered into circular or almost circular orbits. 行星因此把它们随机运动的动量，移转给那些命运悲惨的微行星，而进入近乎圆形的轨道中。
Design of reciprocating circular orbit 圆周往复式循环轨道的设计方法
Gazelles can move with astonishing velocity. 羚羊跑起来速度惊人。
Lashing velocity of pump is concerned with nature of air. 泵的抽气速率与气体的性质有关。