The three force system of the spine and fixed to play the role of traction, so that the spine flexible and flexibility, so that people can do the normal cervical curve, thoracic curve, lumbar curve.
这三个力系对脊椎起到牵引和固定的作用，使脊柱具有弹性和柔韧性，使人们可以做到正常的颈弯，胸弯，腰弯。
Whiplash is an injury to the cervical region of the spine when a great force causes the neck to go beyond its normal range of motion.
挥鞭样损伤是巨大的外力使颈部运动超出正常活动范围时脊柱颈段受伤。
The measured critical value of stability loss for normal and healthy cervical spine is 887n, while the ultimate strength 1457n.
经测量发现，正常颈椎失稳的临界值为887n，极限强度值为1457n。
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