Dualleh杜阿莱dualadj.双重的；成双的n.双数dual-scale model双尺度模型dual-purpose gun高平两用炮dual material gate异质栅dual level sensing双电平读出Dual Track Balance二元制衡dual - reduction双还原dual measure space对偶测度空间dual induction log双感应测井dual-chain bench双链拔丝机dual-box slasher双浆槽浆纱机