Methods: 6 flesh lumbar vertebrae (L1 ~ L5) of sheep were harvested, and were placed on the 3-d spine motion test machine to get the motion of 6 freedom degrees.

方法：新鲜羊腰椎标本6例(L1 ~ 5)，置于脊柱三维运动实验机上进行六个自由度的运动。

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One thing Dr. Kathy had taken time out to show the boy was a freestanding 3-D model of a human spine that had not been taken care of in any real or significant way.

NEWYORKER: Backbone