The developing tools for hypersonic vehicle, i. e. ground test, computation and flight lest all have limitations for simulating hypersonic flight.

高超声速飞行器的设计工具，即地面试验、计算和飞行试验，在模拟高超声速飞行方面都有其局限性。

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In this paper, principle, design and test result of MMW wide beam antenna on flight vehicle is introduced.

本文介绍一种用于飞行器上的毫米波宽波束天线的原理、设计方法和实验结果。

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The agency carried out a test flight of its next-generation launch vehicle for astronauts.

VOA: special.2009.12.30

It is to serve as the test flight vehicle for a new series of commercial passenger spaceliners that will be operated by Virgin Atlantic Airways.

BBC: NEWS | Science/Nature | 'No experiments' for SpaceShipOne

Like Amazon, the company is secretive, but last September it revealed that it had lost an unmanned prototype vehicle during a short-hop test flight.

ECONOMIST: Brain scan

During a second flight test in January, the Raytheon kill vehicle missed the target by 100 feet because two "end-game" sensors both experienced mechanical failures.

CENTERFORSECURITYPOLICY: Center For Security Policy