因此，有必要对亚音速飞行器的导航方案进行改进。
Therefore, it is necessary to improve the current navigation means of the subsonic vehicle.
波音公司的“亚音速终极绿色飞行器研究”（SUGAR）团队检验了5个概念。
The Boeing Company's Subsonic Ultra Green Aircraft Research, or SUGAR, team examined five concepts.
未来飞行器团队报告：亚音速概念。
社会经济学减排方案对于亚音速和超音速飞行器进行了评估和报告。
The socioeconomic issues associated with mitigation options are assessed and reported for both subsonic and supersonic fleets.
社会经济学减排方案对于亚音速和超音速飞行器进行了评估和报告。
The socioeconomic issues associated with mitigation options are assessed and reported for both subsonic and supersonic fleets.
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