空天飞机（NASP）是水平起飞、着陆的单级入轨飞行器。
The National Aerospace Plane(NASP) is a horizontal takeoff and landing, single-stage-to-orbit vehicle.
吸气式高超声速飞行器是下一代单级入轨和高超声速巡航研究的重点飞行器。
Air-breathing hypersonic vehicle(AHV) has been the next generation single stage to orbit vehicle and hypersonic cruise vehicle.
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