Double low双低doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double-axis flexure hinge双轴柔性铰链double open end screwdriver双头螺丝起子double methods of titration两种滴定法double-mercerizing method双浸碱法double puntrure laparoscopy双穿刺腹腔镜检查double-face flat speculum双平面镜double heterojunction laser双异质结型激光器,双异质结激光器double ended structure tube二端出线式电子管double rolling circle model双滚环复制模型double-edged incising saw双头切割锯