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並前往https://www.newscientist.com/article/2165683-nasa-is-trying-to-build-a-supersonic-aircraft-without-the-boom/

NASA is trying to build a supersonic aircraft without the boom

The aircraft, known as an X-plane, is planned to be 29 metres long and fly at about 55,000 feet at a speed of approximately 1,500 kilometres per ...

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