ball-and-socket support
cast ball-and-socket support
ball and socket bearing
ball and socket coupling
ball and socket steering knuckle
ball and socket structure
ball and-socket bearing
ball-and-socket bearing
ball-and-socket coupling
ball-and-socket joint
球臼关节
杵臼关节
万向接头
球形铰链连接
球窝接头
球与套接头
球窝节
滚珠轴承
方向接头
球状关节
ball-and-socket structure
中华绒螯蟹(Eriocheir sinensis)
关节构造