double up同宿一屋； 把 ... 对折； 弯着身子doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double dynamics双动力Double freezing重复冷冻double foolscap双足裁double-seatern.双座机double strategy双重策略double-geared双级齿轮传动double dividend双红利double a number使数目加倍double arc gear双圆弧齿轮double-girder双梁