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.
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。
The agency has plans for another 11-second hypersonic flight, this time at 10 times the speed of the sound.
美国国家航空航天局计划进行再一次的11秒超音速试飞，这次会以10倍于音速的速度进行。
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