短语词组短语gearbox x head 变速箱头head gearbox 旋翼减速器front head gearbox 前旋翼减速器rear head gearbox 后旋翼减速器front end head gearbox 前旋翼减速器rotor head gearbox 旋翼减速器frong head gearbox 前旋翼减速器head breadth gearbox 旋翼减速器 返回 gearbox head