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单词 dual
释义 du·al
I. \ˈd(y)]üəl, ]u̇əl also ]ül\ adjective
Etymology: Latin dualis, from duo two + -alis -al — more at two
1. of an inflectional form or grammatical number : denoting reference to two
 < Gothic wit “we two” is a first person dual pronoun >
— compare plural, quadrual, singular, trial
2.
 a. : consisting of two parts or elements : double, twofold
  < the dual tones of an American toad's song — W.P.Smith >
  < that the work of a painter who looks important in England … has stood up to the dual test of international competition and the Adriatic sun — David Sylvester >
 b. : having two aspects : having a double character or nature
  < the man had a dual nature, one half positive and passionate to yearning, one half negative, satirical, and really perverse — H.S.Canby >
  < immigrants, as a rule, retain a dual patriotism — Bertrand Russell >
 c. : containing two or being one of two often identical parts : twin
  < high-compression heads complete with a dual exhaust system — Gregor Felsen >
 d. : consisting of or used on a pair of wheels (as automotive driving wheels) joined together side by side (as by bolting or welding) on a common axle
  < dual tires >
3. : characterized by a division of controlling agents or factors: as
 a. : consisting of two sets of authorities having mutually exclusive spheres of power
  < a dual federalism >
  < a dual form of government >
 b. : fitted for operation by either or both of two agents
  < driving lessons given on dual-control cars >
  < dual-fuel engines that run on oil or oil and gas >
II. noun
(-s)
1. : the dual number of a language or a form in it
2. : the result obtained in consequence of interchanging conjunction and alternation throughout a formula in the propositional calculus
3. : a chess problem for which two solutions exist
4. : a pair of dual wheels or dual tires
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更新时间:2024/9/20 18:01:35