| http://www.w3.org/ns/prov#value | - Of course, the portions to be disposed on the indicator are not restricted to the feet of the robot, rather, any portions can be placed thereupon such as hands or hip, as long as the portion can be placed on the indicator, can facilitate the visual line direction of the stereo camera to be determined thereby, or can facilitate the attitude of the robot to adjust the visual line direction of the st
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