求翻译：临近空间飞行器在国防与民用中有着广泛的应用前景，为当前世界各国的研究热点。除了平流层飞艇外，高空共轴双旋翼涵道飞行器也是一种可行的方案。本文开展了高空共轴双旋翼涵道飞行器的可行性分析，并根据分析结果给出可行的初步方案。主要工作如下：是什么意思？

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Close to the space vehicle in defense and civilian, in which there was a wide range of potential applications. It is the current world research hot spots. In addition to the stratosphere airboat ride, Altitude coaxial tandem rotor by aircraft is also a viable program. This launched a high co-axial d

The approaching space flight vehicle and civil has the widespread application prospect in the national defense, for current various countries research hot spot.Besides the stratosphere airship, the upper air coaxial twin contains a flight vehicle also is one kind of feasible plan.本文开展了高空共轴双旋翼涵道飞行器的可

Near space aircraft in national defense and has a wide range of civilian applications, for the current hot spot in the world. Apart from stratospheric airship, upper ducted coaxial rotor aircraft is also a viable option. Coaxial dual-rotor carried out high altitude bypass feasibility analysis of air

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