dualistn.二元论者dualadj.双重的；成双的n.双数dual standard test差别试验:一种酿造产品的感官检查法dual approximation对偶逼近dual-perspective双重视角dual color copying双色复印dual points method对偶点法dual effect mutant双重效应突变体dual economy model二元经济理论dual-mode coding双模式编码dual progress plan双重轨升级制dual column system双柱系统