双磁铁电子枪double magnet gun
双阴道double vagina
双柱铣床double column milling machine
纬二重提花织物figured weft double cloth
双交替法double alternate method
【运输】自动化操作区、双车道的automatically operated section block, double-tracked
双脉冲发生器double pulse generator
双筒生物显微镜double-tube biologic microscope