双阴道double vagina
双面缎double satin
三极双掷闸刀开关three-pole double-throw knife switch
双柱龙门刨铣床double column plano-milling machine
双柱铣床double column milling machine
双量子受激发射器double-quantum stimulated-emission device【光】
【化】 双面焊对接接头double-welded butt joint
双端靠模铣床double end profiler【机】