Dualln.杜阿尔dualadj.双重的；成双的n.双数dual clutch双离合器dual-drum双筒,双轮dual system对偶系统,双重系统,双管系统,双系统,双重分配通路dual sports对抗运动项目Dual Lenses双透镜dual-feed双路馈电,双端馈电dual bundle对偶丛dual-core双核dual spaces对偶空间dual-bootn.双引导