ball-and-socket ankle joint杵臼踝关节
Ceramic ball-and-socket joint发明名称
ball-and-socket joint n肩
Cast ball-and-socket support joint铸钢球铰支座节点
ball-and socket joint杵臼关节
N（名词） a coupling between two rods, tubes, etc, that consists of a spherical part fitting into a spherical socket, allowing free movement within a specific conical volume 球窝接头