短语词组短语combination lever bend arm [铁路]合并杆弯臂lever r arm 杠杆臂lever shaft arm 杠杆轴臂shoe lever lifting arm 鞋形杆举起臂stop lever shaft arm 停车手柄轴摇臂lever -arm ratlo 标臂比whistle lever shaft arm 汽笛杆轴臂;翻译lever rocking arm 闩柄杠杆 返回 lever arm