dualtireadj.双轮的dualadj.双重的；成双的n.双数dual-band microstrip antenna双频微带天线dual flame ionization detector双火焰电离检测器dual dimension trade character双维贸易性dual-computer fault tolerant双机容错dual push-pull amplification两级推挽放大dual polysilicon material gate复合多晶硅栅dual qualitative sinfilarities双定性相似度Dual-Band doppler ultrasound双频超声波多普勒dual flank gear rolling tester双面齿轮啮合检查仪dual retention/drainage aid二元助留助滤剂