The inner side surface of the ball sleeve is contained outside the joint head in an insulating way to form a cardan joint.

球套内侧面吻合包含于关节球面之外，形成万向节。

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The inner side surface of the ball sleeve is contained outside the joint head in an insulating way to form a cardan joint.

球套内侧面吻合包含于关节球面之外，形成万向节。

youdao