doubledeckn.双层结构adj.双层的doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double ported vale双口阀double bevel scale双斜面刻度double gang packer双列镇压器double anode valve双阳极管double-channeled双通道double arming bolt无头穿钉double coiler card双圈条梳棉机double bank engine双排式柴油机,双排式内燃机double herringbone双人字纹double check valve双止回阀,双单向阀