The aircraft is a collaborative effort between the U.S. Air Force Research Laboratory, the Defense Advanced Research Projects Agency, Boeing and Pratt &Whitney Rocketdyne.
这架飞机是美国空军研究实验室，美国国防部，波音公司和普惠洛克达因公司的共同研究成果
The aircraft is a collaborative effort between the U.S. Air Force Research Laboratory, the Defense Advanced Research Projects Agency, Boeing and Pratt &Whitney Rocketdyne.
这架飞机是美国空军研究实验室，美国国防部，波音公司和普惠洛克达因公司的共同研究成果
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