| 单词 |
infrasound |
| 释义 |
infrasound|ˈɪnfrəsaʊnd|
[f. infra- + sound n.3, tr. F. infra-son (1906 in Robert).]
Sound, or a sound, of infrasonic frequency.
1930A. B. Wood Textbk. Sound ii 213 The ‘ondes de bouche’ (from the mouth of the gun) consists principally of waves of very low frequency (of the order 1 p.p.s.), described by Esclangon as Infra-Sounds. 1965Aerospace Med. XXXVI. 824/1 Very low sonic frequency noise and moderate levels of infrasound are commonly encountered in conventional aerospace operations. 1970B. W. Aldiss Moment of Eclipse 66 This was infrasound. The plant was emitting slow air vibrations at less than ten hertz. 1971Observer 28 Nov. 3/1 Many cars and lorries travelling at sustained high speeds produce such intense levels of low-frequency noise or ‘infrasound’ inside them that drivers can experience symptoms very similar to those produced by heavy drinking. Ibid., In a wide range of passenger cars travelling at motorway speeds the sound energy is largely concentrated as intense infrasounds—most of which can be felt rather than heard. |
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单词 infree 释义 † infree, a. Sc. Obs. rare—1.[in-3.]Not having the freedom of a borough......