double ear双耳doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double-barrelled fowling piece双管鸟枪double-dog type furnace pusher双列推爪式肪用推钢机double- level non- linearity双重非线性double-step write compensation双阶跃写入补偿double-break circuit-breaker双断断路器double reduction bevel spur gear双级圆锥圆柱齿轮减速器double-layer longitudinal beam双层纵梁double-competency construction双师结构double motor AC generator system双马达交流发电机系统double-current simplex circuit双流单电路