脊骨

例句：

1. 1. The doctor advised him to exercise regularly to maintain his health.
   医生建议他定期锻炼以保持健康。
2. 2. She spent the whole afternoon reading books about human anatomy.
   她花了整个下午阅读关于人体解剖学的书籍。
3. 3. He stood up and stretched his back, feeling a sharp pain in his spine.
   他站起来，伸了伸背，感觉到脊柱一阵剧痛。