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.

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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.

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未来飞行器团队报告：亚音速概念。

Future Aircraft Team Presentations for Subsonic concepts.

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