| 释义 |
ultra-high, a.|ʌltrəˈhaɪ|
[f. ultra- 3 + high a.]
1. Radio. Of a radio-frequency: in the range 300 to 3,000 megahertz. Abbrev. UHF s.v. U 4 a.
1932Proc. IRE XX. 95 Among the significant and comparatively recent developments in electrical engineering is the efficient and dependable production of ultra-high-frequency oscillating circuits. 1935Discovery Sept. 278/2 Special valves are being developed suitable for direct signal amplification at the ultra-high frequencies. 1940Jrnl. R. Aeronaut. Soc. XLIV. 216 Another application of ultra-high frequencies is to provide a system of instrument landing. 1951Electronic Engin. XXIII. 452 The use of ultra high frequencies for communication purposes is a relatively new and rapidly developing branch of radio. 1978Dædalus Spring 212 There is already a good deal of listening in the ultrahigh frequency radio bands.
2. gen. Exceedingly high; freq. in attrib. phr. in comb. with following n.
1936Discovery Mar. 88/1 The G.W.R. and the L.N.E.R. have been even more enterprising in introducing some ultra-high-speed expresses. 1962F. I. Ordway et al. Basic Astronautics vii. 327 Ultrahigh-risk equipment. 1966D. G. Brandon Mod. Techniques Metallogr. iv. 184 Methods for obtaining ultra-high vacua (UHV) are now highly developed. 1972D. Halberstam Best & Brightest 558 At West Point he again had ultrahigh visibility and he impressed everyone. 1977P. Johnson Enemies of Society i. 4 The extended family also dissociated procreation from the responsibility to maintain offspring, and so produced ultra-high birthrates. 1981Economist 24 Jan. 49/3 How long can Britain go on protecting its farmers from competition from imported UHT (Ultra-High Temperature, or long-life) milk? |