1.
The tilt of the earth's axis, not the shape of its orbit, is what is responsible for the seasons.
形成季节的主要因素不是地球公转轨道的形状，而是地球自转轴的倾斜。
2.
The path of the earth around the sun is oval.
地球围绕太阳公转的轨道是椭圆形的。
3.
geostationary transfer orbit
对地静止转移轨道(转移轨道)
4.
the five major planets each have their own orbit, but all revolve around the sun.
五星各有各的运行轨道, 但都绕着太阳公转。
5.
Transfer Trajectory Design for Halo Orbit with Multiple Constraints
约束条件下的Halo轨道转移轨道设计
6.
Public registry of objects launched into orbit or beyond
射入轨道或轨道以外物体之公开登记
7.
A Study on the Switching and Its Controlling of the Switch and Nose Rails in High-Speed Turnout;
高速道岔尖轨与心轨转换及控制研究
8.
the time for the earth to make one complete revolution around the sun, relative to the fixed stars.
以恒星为基准测定的地球在环绕太阳的轨道上公转一整周的时间。
9.
This motion of an object in an orbit about a center is called revolution.
像这种一个物体环绕某个中心所作的轨道运动叫做公转。
10.
This motion of an object in an orbit about a center as called revolution.
象这种一个物体环绕某个中心所作的轨道运动叫做公转。
11.
period between successive conjunctions with a star, 27.322 days.
以恒星位置为基准月球在轨道上公转一周的平均时间，即/天。
12.
A Shape-based Approach to Rapidly Design Interplanetary Low-thrust Trajectories
基于轨迹成型法星际小推力转移轨道快速设计
13.
Transfer Structure Optimization of First Drawing Point in Turn-out with Movable-point Frog
可动心轨道岔一动心轨转换结构优化研究
14.
and follows an orbit round the sun,
它依循一定的轨道绕着太阳运转，
15.
switch a train into a siding
把一列火车转入支线轨道.
16.
They switched the train to the other track.
他们把列车转到另一轨道上。
17.
The spacecraft orbited Mars three times.
太空船绕火星四周的轨道转三周。
18.
Optimum Orbit Transfer and Rendezvous of Spacecraft;
航天器轨道转移与交会最优控制研究