doubleword双字doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double-low hybrid rape双低杂交油菜double prism field glass双棱镜野外镜double cylinder jacquard双花筒提花机double extre strong pipe特强厚壁管double-tuned amplifier双调谐放大器double cascade quenching二梯零火double flexible coupling双挠性联轴节double diffusion effects双扩散效应double color rubber pipe双色胶乳浸渍管double lattice structure双重网格结构