dualistn.二元论者dualadj.双重的；成双的n.双数dual light sources双光源dual-armed robot双臂机器人dual beam betatron双射线电子感应加速器dual wheel control双轮操纵dual-arc welding双弧焊dual-stage model二元分析模式dual chain complex对偶链复形dual- wavelength双波长dualistic religion二元神教dual rupture disks双防爆膜