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.
因此快速生成最优轨迹对保障亚轨道飞行器任务的完成至关重要。
Therefore, it is very important for its mission completion to generate an optimal trajectory.
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.
XCOR是开发亚轨道飞行器、用于商业太空飞行的几家公司之一。
XCOR is one of several companies developing suborbital vehicles for commercial space tourist flights.
许多开发人员具有很高的希望，PDE将最终成为最具成本效益的推动超音速亚轨道飞行器的有效方法。
Many developers have high hopes that the PDE will ultimately become the most cost-effective method of propelling supersonic sub-orbital craft.
在1981年和1985年，有四架轨道飞行器进行了服务，它们是“哥伦比亚号”(第一架进入轨道的)、“挑战者号”、“发现者号”和“亚特兰提斯号”。
Between 1981 and 1985, four shuttle orbiters were put into service: Columbia (the first in orbit), Challenger, Discovery, and Atlantis.
在1981年和1985年，有四架轨道飞行器进行了服务，它们是“哥伦比亚号”(第一架进入轨道的)、“挑战者号”、“发现者号”和“亚特兰提斯号”。
Between 1981 and 1985, four shuttle orbiters were put into service: Columbia (the first in orbit), Challenger, Discovery, and Atlantis.
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