Dualleh杜阿莱dualadj.双重的；成双的n.双数dual-equivalence双重等效dual field of view双视场dual juxtaposition二项并置dual coding theory双重编码论dual tariff system复关税率制Dual Planes Toggle双平面切换dual ratio control二级微动控制dual accelerometer双联加速度表dual-fuel engine双燃料发动机,双用燃料发动机dual sensitization双重过敏