尽管理论上还可以包括平面，但平面却不能加以约束，因此只相当于开式运动链。
Although a planar pair might theoretically be included, this would impose no constraint and thus be equivalent to an opening in the kinematic chain.
尽管理论上还可以包括平面副，但平面副却不能加以约束，因此只相当于开式运动链。
Although a planar pair might theoretically be included, this would impose no constraint and thus be equivalent to an opening in the kinematic chain.
相似平台3upu并联机构工作空间为三个开式运动链工作空间的交集，近似为一圆锥体。
The workspace of similar platform 3upu is the workspace intersection of three open chains, which is a cone approximately.
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