the obstacle to supersonic flight posed by such factors as increased drag and reduced controllability, which occur when aircraft not specially…
| 单词 | θ65531 |
| 释义 | the world > physical sensation > hearing and noise > thing heard > [noun] > sound > sound barrier (2) sound barrier1939 the obstacle to supersonic flight posed by such factors as increased drag and reduced controllability, which occur when aircraft not specially… sonic barrier1945 (in early use) the collective technological obstacles to attaining supersonic speed; (now) the speed of sound conceived as a physical barrier; = so… |
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