Dual PWM双PWMdualadj.双重的；成双的n.双数dual-oplarization laser双偏振激光器dual-wavelength tunable双波长可调谐Dual directional collapse双向倒塌Dualistic Transition Cost二元转化成本dual-purpose flat files两用扁锉dual well micro-logging双井微测井dual-color fluorescence双色荧光dual effect of investment投资的双重效应dual urban-rural system城乡二元结构dual auto alternate sweep双自动交替扫描