近地轨道飞行只是他的试验田。
返回轨道设计关系着亚轨道飞行器能否安区返回。
Return trajectory design is related to the safe return of the vehicle.
亚轨道飞行器飞行任务的主要特点是任务多样，任务时间间隔短。
Mission diversity and short preparation time are the main features of Suborbital Launch Vehicle.
这次飞行的目的是为了测试新的航天飞机系统能否安全的进入轨道和安全的返回地球着陆。
The aim of this flight was to test the new shuttle system, to go safely up into orbit and to return to the Earth for a safe landing.
在太空飞行时他们改变了轨道。
神七在343公里高空的轨道绕地球飞行。
Shenzhou Seven will orbit the Earth at an altitude of 343 kilometers.
飞行器需要首先识别目标，然后调整自己的轨道进行抓取。
Aircraft need to first identify the target, then adjust their orbit for fetching.
1981年首次将航天飞机送进轨道的飞行。
The first flight of a space shuttle into orbit took place in 1981.
月亮可能是按照一个椭圆形的轨道围绕我们的地球飞行。
该航天器在绕月球轨道上飞行。
The spacecraft is in orbit (ie moving in orbit) round the moon.
卫星在它的固定轨道里绕地球飞行。
研究了标称飞行轨道最优交会点选取，交会时间与发射时间计算等问题。
The ideal rendezvous time, launch time and rendezvous point in space were studied.
这些陆基系统不会对空间飞行器造成持久性的伤害并且不会在轨道上生成碎片。
They would inflict no lasting damage to spacecraft and create no debris in orbit.
这些陆基系统不会对空间飞行器造成持久性的伤害并且不会在轨道上生成碎片。
They would inflict no lasting damage to spacecraft and create no debris in orbit.
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