consisting of or involving two parts or components usually in pairs
同义词：double, dual
duple详细解释
du.ple adj.（形容词）Consisting of two; double.双的；二倍的Music Consisting of two or a multiple of two beats to the measure.【音乐】 双拍子的：每小节含有两拍或偶数拍的 来源：Latin duplus * see dwo- 拉丁语 duplus *参见 dwo-
