| 释义 |
unidiˈrectional, a.
[f. uni- 1 + directional a.]
Having or being motion in one direction; operating or functional in one direction only.
1883Knowledge 13 July 25/2 Intermittent, unidirectional currents in the brushes. 1894Athenæum 9 June 745/3 Note on the Possibility of obtaining a Unidirectional Current to Earth from the Mains of an Alternating Current System. 1946Nature 9 Nov. 674/2 The simplified apparatus was..actuated by unidirectional air flow. 1955O. G. Sutton Sci. of Flight 36 The effect is to give an additional but unidirectional motion to the molecules of air. 1961A. Nisbett Technique Sound Studio i. 23 Cardioids—sometimes called unidirectional microphones—have a heart-shaped response. 1962Y. Malkiel in Householder & Saporta Probl. Lexicogr. 13 The kernel of Howell's..Lexicon tetraglotton (1660) is a unidirectional dictionary providing for the translation of each English entry into French, Italian, and Spanish. 1971I. G. Gass et al. Understanding Earth xiii. 174/2 The uni-directional flow of rivers is complicated by the development of meanders. 1975Sci. Amer. Mar. 36/1 For years psychologists have been concerned with the effectiveness of unidirectional modes of communication such as highway signs, books, lectures and television programs. 1983Trans. Philol. Soc. 6 The impression that [linguistic] evolution is neat, continual and unidirectional is a mirage. 1984What Video? Aug. 59/1, 1·5 in. electronic viewfinder, unidirectional mike but it is heavy.
Hence ˌunidirectioˈnality; unidiˈrectionally adv.
1958W. D. Kingery Ceramic Fabrication Processes viii. 70/2 A much more suitable method is to apply pressure from all sides instead of unidirectionally. 1960A. C. Spaulding in Dole & Carneiro Essays in Science of Culture 454 Unidirectionality of formal changes through time is simply the idea of cultural evolution. 1968Science 21 June 1365/3 The unidirectionality observation..may be placed in correspondence with certain findings concerning functional neuroanatomy of OKN [sc. optokinetic nystagmus]. 1970Proc. I.E.E.E. Aug. 1252/1 Unidirectionality increases transducer conversion efficiency by 3 dB. 1976Nature 10 June 516/1 Replication..proceeds either unidirectionally or bidirectionally away from this site. 1980English World-Wide I. i. 16 If there was initially unresolved conflict at the level of decision-making this lack of unidirectionality can be expected to re-emerge at the implementation stage. |