An aircraft whose maximum speed is less than the speed of sound. Cf. supersonic, n.
| 单词 | θ207893 |
| 释义 | society > travel > air or space travel > a means of conveyance through the air > aeroplane > [noun] > capable of supersonic speed > not (1) subsonic1957 An aircraft whose maximum speed is less than the speed of sound. Cf. supersonic, n. |
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