| 单词 | sonic speed |
| 释义 | > as lemmassonic speed sonic speed n. the speed at which sound waves travel in a particular medium, esp. air; the speed of sound; cf. sonic velocity n. [In quot. 1939 after Italian velocità del suono speed of sound (18th cent. or earlier; also in the paper abstracted in this quot.).] ΘΚΠ the world > physical sensation > hearing and noise > thing heard > [noun] > sound > sonic speed sonic speed1939 sonic velocity1942 1939 Aircraft Engin. Sept. 354/1 The shock wave represents a spasmodic recompression after the expansion which occurs at sonic speed on the upper trailing edge. 1962 F. I. Ordway et al. Basic Astronautics viii. 344 At this point the body is moving at sonic speed and transonic conditions exist. 2012 Irish Examiner (Nexis) 9 Oct. He'll produce about 300kw of heat when falling at sonic speeds. < as lemmas |
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