double X双X(染色体)doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double drive双桥传动double-ply双股,双层double tooth复齿锯double diode双二极管double value赔偿损失时的加倍付给double touch双触键,双铁芯接触磁化double mixer双混合室Double Words双字double decks双层桥面double screw双螺杆