doublemakeadj.双闭合的doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double loop control双环控制double weight paper厚纸double-rate meter双费制电度计Double serial ports双串口double torsion test双力矩试验double wire machine双线机double quirk-head双槽圆线脚double-face valve双面阀double rotation arm双旋转臂double-bed filter双层滤料滤池