四: four联杆机构: link mechanism双摆杆四联杆机构: double swing mechanism四联杆机构运动: parallel link motion四联杆结构: pantagraph; pantograph四联杆菌: bacillus tetragenus带四联杆的剪刀: combination snips四联杆式卸船机: double link unloader操纵杆机构: joy-stick joystick mechanism杠杆机构: bar linkage; lever assembly; lever mechanism; lever motion; leverage; linkage拉杆机构: drag link mechanism; drag-link mechanism连杆机构: bar linkage; connecting rod gear; connecting-rod gear; connectingrodgear; link gear; link mechanism; link rod assembly; linkage assembly; mechanism of connecting rod六杆机构: six-bar linkage起绒杆机构: wire motion三摇杆机构: triple rocker mechanism双杆机构: double lever mechanism; double-lever mechanism双摇杆机构: double rocker mechanism四杆机构: four-bar linkage四连杆机构: four bar linkage mechanism; four bar mechanism; four link mechanism; four-bar linkage; four-bar mechanism; quadric crank mechanism挺杆机构: tappet gear推杆机构: transfer bar mechanism摇杆机构: endplay device; rocker mechanism; slotted link mechanism遥杆机构: rocker mechanism游戏杆机构: rocker mechanism背杆曲连杆机构，四连杆机构: quadratic crank mechanism
