资料来源 : Free On-Line Dictionary of Computing

degrees of freedom
     
         The number of independent parameters required to
        specify the position and orientation of an object.  Often used
        to classify {robot} arms.  For example, an arm with six
        degrees of freedom could reach any position close enough and
        could orient it's end effector (grip or tool etc.) at any
        angle about the three perpendicular axes.