短语词组短语seat -post test methods 自行车安全要求坐垫和坐垫杆测试方法Seat post clamp 座杆束子;座杆束;座杆夹;坐管夹seat post & clamp 坐杆;座杆及束子Intergnated Seat Post 一体座杆Seat Post Dlamp 座杆束Integrated seat post 一体式座管 返回 seat post