• 双重意义

double fin双立尾doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double furrow plough双铧犁double-ring method双套环法double action clutch双作用离合器double-deck bridge双层桥double thrustbearing双向止推轴承double piston engine双活塞发动机double radial engine双径向排列发动机double current relay双流式继电器double circular pipe二重喷管double-linked gear双联齿轮