换句话说：太空署梦想着设计大型轨道炮来将超高速太空飞行器以盲速发射至大气层。
Put another way: NASA is dreaming up massive railguns to launch hypersonic space vehicles into the atmosphere at blinding speeds.
事实上，这个轨道飞行器已经完成了它的全部任务，按照设计，它的寿命为6个月，到今年4月1日为止。
The orbiter had actually finished all its tasks within its designed life span of six months by April 1 this year.
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.
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