double box双窝doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份Double sheet metal双金属片double stroke bell双击电铃double differences双差double sticky tape双面胶带double sided board两面印制电路板double image prism双像棱镜double-leg slide双腿滑挡double-fold step双蝶步double cleft-lip双唇裂double oppositions双重对立