doublemakeadj.双闭合的doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double-dictionaryn.双向字典double bandsilicate双链硅酸盐double layer filter双层滤池double pointed tack双尖钉double-focus tube[医] 双焦点管double slag process双渣法double contact plug双接点插座double-front axle双前桥double-head arrow双箭头double sleeve valve双套阀