1.
Planets roll on their courses.
行星在轨道上运行。
2.
The SMV could re main in orbit for up to a year before landing autonomously on a runway.
太空机动飞行器可以在轨道上运行一年之久，然后自行在跑道降落。
3.
To decrease in orbit.Used of an artificial satellite.
能量衰减指人造卫星在轨道上运行时能量消减
4.
A small truck or car operating on a track and used in a mine, quarry, or factory for conveying materials.
小矿车，小贷车在轨道上运行的小型卡车，且用在矿
5.
Not running on tracks or rails.
无轨的不在轨道或铁轨上运行的
6.
(of planets,etc)moving in an eccentric orbit
（指行星等）在不正圆的轨道上运行的.
7.
They were watching the orbit of the rocket on the screen.
他们在观察屏幕上的火箭运行轨道。
8.
moving in its orbit with the gleam and the speed of light.
以光的速度在它的轨道上运行着。
9.
The stars in their courses, ie the way they appear to move
在轨道中运行的星球
10.
A rail or set of parallel rails upon which railroad cars or other vehicles run.
铁轨铁路车厢或其它车辆可在上运行的一条或一套平行轨道
11.
The point on the orbit of a celestial body that is farthest from the sun.
远日点在天体运行轨道上距离太阳最远的点
12.
Trains run on a railway track.
火车在铁路轨道上行驶。
13.
The train is running on the outside track.
列车正在外轨上运行。
14.
Something that orbits, especially a spacecraft that orbits a planet or moon without landing on it.
轨道飞行器循轨道飞行的物体，尤指循一行星或月球运行而不在其上着陆的宇宙飞船
15.
The moon travels in an elliptical orbit in relation to the equator, swinging back and forth over the northern and southern hemispheres.
月球在与赤道相对的椭圆形轨道上运行，往返于南北半球的上空。
16.
Traveling in an orbit that passes over a planet's north and south poles.
行经极地的在一条经过一行星南北极上空的轨道中运行的
17.
Any one of the28 divisions of the moon's monthly path.
月球每月运行轨道上28个区域之一
18.
The intersection plane of the earth's orbit with the celestial sphere, along which the sun appears to move as viewed from the earth.
黄道地球运行轨道与天球的交界面，在地球上看，太阳似乎沿着黄道运行