double six双六doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double first cousin双重亲表兄妹double chromosphere双色球double-clad fiber双包层光纤double probe system双探针系统double-dot method双点法double-rail logic双轨逻辑, 双线逻辑double n/p ratio双n/p比double flange wheel双法兰轮double-clad board双面印制板double function key双功能键