The earth's gravity slows the moon's rotation, matching it to the speed of its orbit.
地球引力减缓了月球的自转速度，使之与其轨道的速度相匹配。
The mirrors could orbit—thousands of miles high—at the same speed as the earth turns on its axis.
这些镜子可以在几千英里的高空以地球绕地轴旋转的速度运行。
And the weight of the spacecraft orbit, the rocket needed to provide energy and speed varies, with a variety of track between the speed of a certain relationship.
航天器的重量和轨道不同，所需火箭提供的能量和速度也各不相同，各种轨道与速度之间有一定的对应关系。
Scientists think that this speed coupled with the planet's heft yields strong gravitational tugs that can alter the planets orbit.
科学家们认为这个速度加上行星的重量屈服于强大的重力牵引力，可以改变行星的运行轨道。
That the sandwich stands still, has no speed in orbit anymore.
意思是三明治不动，在轨道中没有速度。
But the satellites will arrive with less relative speed than spacecraft making the trip in three days, which means less fuel will be needed to brake and drop into lunar orbit.
但是相比太空飞船，卫星着陆时需要相对小的速度，这将需要三天的时间，意味着消耗更少的燃料进入绕月轨道。
Like racing cars that swerve and hit each other on a circular track, the moons' speed relative to each other is low because they travel in nearly the same orbit.
这有点像是突然转向的赛车在环形赛道上相撞，月亮们也在同一轨道公转，所以他们之间的相对速度很小。
To stay in orbit, an object must be traveling at a constant speed over Earth's surface.
要留在轨道上，一个物体必须以恒定的速度运行于地球表面。
That means you can get the speed of the neutron star, you can get the radius of the orbit, and you can get the period, just like we discussed before.
中子星的速率,得到轨道的半径，得到周期的大小，如之前讨论过的那样，现在取一个光学的。
The surface gravity, which is defined from the 1 bar pressure level in a gas giant's atmosphere, is 90 percent that of Earth's and the speed needed to reach low orbit is lowest of all the gas planets.
表面重力，这个气体巨人的大气层的气压水平限制在一巴范围，是地球的百分之90的并且需要达到的低轨道的速度是所有的气体行星的最低水平。
It is not as much a coincidence as you think, of course. But if something is in orbit, this is the orbital speed at radius r, then always is its total energy is half the potential energy.
但并不是巧合，当然，但如果某物在轨道里，这是在半径r的速度，则总是它的总能量，是势能的一半。
If you know r, then you can calculate the speed in orbit.
如果知道R，就能，计算轨道里的速度。
In a jovian stationary orbit a spacecraft goes around the planet at the same speed as the ionosphere.
在木星的同步轨道上，太空船环绕行星的速度与电离层相同。
All the satellite needs in order to move in its orbit is the initial speed given it by carrier rocket.
卫星要在其轨道上运行所需要的只是由运载火箭给它的初速度。
Electrons orbit at a very speed around the nucleus.
电子以极高速度绕原子核运转。
That is an orbit which turns at the same speed as the rotation of the Earth.
这种轨道是与地球自转保持同步的。
In a Jovian stationary orbit, a spacecraft goes around the planet at the same speed as the ionosphere.
在木星的同步轨道上，太空船环绕行星的速度与电离层相同。
A rocket must attain a speed of about five miles per second so that it may put a satellite in orbit.
火箭必须获得每秒大约五英里的速度以便把卫星送入轨道。
Bulge stars orbit the galactic center at a different speed than foreground stars.
银河中心恒星轨道胀在不同速度比前景恒星。
In order to their cause, they are like two gyro, in their respective high-speed rotating in orbit.
为了各自的事业，他们就像两个陀螺，在各自的轨道上高速旋转着。
Maglev system is a kind of new ground orbit transportation system, and it is the most competitive ability in modern high-speed passenger transportation system in the 21st century.
磁悬浮系统是一种新型地面轨道交通系统，是21世纪颇具竞争力的现代高速客运交通系统。
Tested vibration signal wave form analysis, speed spectrum matrix analysis, and shaft centerline orbit analysis are made.
测得了机组的振动量值，对测得的振动信号进行了波形分析、转速谱阵分析及轴心运动轨迹分析。
Recently, CRH is famous for its convenience, safety, comfort, high-speed, flexible organization and favored by railway transportation and city orbit traffic transportation.
近几年，动车组以其编组灵活、方便、快捷、安全，可靠、舒适等优势备受世界各国铁路运输和城市轨道交通运输的青睐。
The mixer's high speed and small orbit combine to offer true vortexing action in each well of the microplate for complete and uniform mixing.
混频器的高速和小轨道相结合，提供完整和统一的混合真正的微孔板的每个井的涡旋行动。
The mixer's high speed and small orbit combine to offer true vortexing action in each well of the microplate for complete and uniform mixing.
混频器的高速和小轨道相结合，提供完整和统一的混合真正的微孔板的每个井的涡旋行动。
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