In spheric linkages, the axes of all revolute pairs must intersect at point.
在球面连杆机构中, 所有的转动副的轴必在一点上相交.
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In spheric linkages, the axes of all revolute pairs must intersect at a point.
在球面连杆机中, 所有回转副的轴必须在一点上相交.
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"a spherical object"
"nearly orbicular in shape"
"little globular houses like mud-wasp nests"- Zane Grey