You must be sure that, if you're doing a right rotation, the top node has a left child.

必须要确保，如果做右旋，顶端节点必须有一个左子节点。

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Both facet joints, especially the left of the intact model produced larger stresses in right rotation.

髓核摘除模型在前屈、后伸、旋转时小关节的应力均增加。

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Both facet joints, especially the left of the intact model produced larger stresses in right rotation.

髓核摘除模型在前屈、后伸、旋转时小关节的应力均增加。

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