hypersonic test vehicle
... hypersonic ramjet engine 高超音速冲击式空气喷气发动机 hypersonic test vehicle 高超音速试验飞行器 hypersonic transport 高超音速运输机 ...
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并且高超音速飞机目前只演示过由其他飞行器携带小型无人机至高速，而且其他计划中的试验飞行器同样太小不能坐人。
Plus, hypersonic flight has so far only been demonstrated for small unpiloted craft carried to high speed by other vehicles - and other planned experimental craft are too small to carry a pilot.
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