du·ple /ˈdupəl ||ˈdju-/
 (a.)二倍的,雙重的


 Du·ple a.  Double.
 Duple ratio Math., that in which the antecedent term is double the consequent, as of 2 to 1, 8 to 4, etc.

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 duple
      adj : consisting of or involving two parts or components usually
            in pairs; "an egg with a double yolk"; "a double
            (binary) star"; "double doors"; "dual controls for
            pilot and copilot"; "duple (or double) time consists of
            two (or a multiple of two) beats to a measure" [syn: double,
             dual]