So while military aircraft conduct high speed flights over water and at high altitudes, supersonic commercial flights seemed like a brief and failed experiment.
因此，当军用飞机在水上和高空进行高速飞行时，超音速商业飞行似乎是一个短暂而失败的实验。
High Speed Flight
原声例句
TED-Ed（视频版）
英语百科
High Speed Flight RAF
The RAF High Speed Flight, sometimes known as 'The Flight' , was a small flight of the Royal Air Force (RAF) formed for the purpose of competing in the Schneider Trophy contest for racing seaplanes during the 1920s. The Flight was together only until the Trophy was won outright, after which it was disbanded.
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