A joint, as of a bird or quadruped, corresponding to the human elbow.
A joint, as of a bird or quadruped, corresponding to the human elbow.
关节，肘部鸟或四肢动物的关节，相当于人的肘
A joint, as of a bird or quadruped, corresponding to the human elbow.
关节，肘部鸟或四肢动物的关节，相当于人的肘