与美国空军研究实验室开发，并与美国航空航天局进一步改进，在引擎机舱的发动机上，HWB还具有一个不寻常的推进配备。
Developed with the U. S. Air Force Research Laboratory, and further refined with NASA, the HWB also features an unusual propulsion arrangement that houses the engines in overwing nacelles.
RR - AIRSS计划由美国空军空间与导弹系统中心发起，由美国空军研究实验室空间车辆理事会管理。
The RR-AIRSS program is sponsored by the U.S. Air Force Space and Missiles Systems Center and managed by the U.S. Air Force Research Laboratory Space Vehicles Directorate in Albuquerque, n.m..
RR - AIRSS计划由美国空军空间与导弹系统中心发起，由美国空军研究实验室空间车辆理事会管理。
The RR-AIRSS program is sponsored by the U.S. Air Force Space and Missiles Systems Center and managed by the U.S. Air Force Research Laboratory Space Vehicles Directorate in Albuquerque, n.m..
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