The arm of the multi-joint manipulator <br>can be divided into a small arm and a large arm. The connection between the forearm and the upper arm (elbow) and the connection between the upper arm and the body (shoulder) are joint (hinge) connections. That is to say, the forearm can swing up and down around the elbow to the upper arm, the upper arm can swing around the shoulder in many angles, and the arm can also rotate left and right.
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