spine
词根词缀：
porcupine n. 豪猪
porc 猪 + upin〔= spin 刺〕+ e → 有刺的猪 → 豪猪
spinal adj. 脊柱的，脊髓的
spin 刺 + al …的，具有…性质的 → 如刺一般的 → 脊柱的
spine n. 刺；脊椎
spin 刺 + e → 刺；脊椎
spiny adj. 多刺的；困难重重的
spin 刺 + y 多…的 → 多刺的；困难重重的
数据来源：新东方英语词汇速记大全
相关例句：
If you have a healthy spine, you will decrease the likelihood of back pain.
如果你拥有健康的脊椎，你就减少了背痛的可能性。
And repair the damage to your spine.
还有修复了你的脊椎。
If you have diabetes, osteomyelitis may occur in the spine and in bones of the feet.
如果你有糖尿病，骨髓炎可能发生在脊椎和骨中的双脚。
His spine was damaged between the fourth and the fifth cervical vertebrae.
他的脊椎受伤部位在第四和第五椎骨之间。
The condition involves disk cartilage bulging between vertebrae in the lower spine and pressing against a nerve.
这种状况包括了椎间盘膨出在脊椎上和压迫神经。
Lumbar segmental instability is a temporary phase in the degenerative process of the lumbar spine.
腰椎节段性失稳是腰椎退变过程中一个暂时的阶段。