龙骨的前端部

例句：

1. 1. Thespine of the animal is made up ofmany vertebrae.
   动物的脊柱由许多椎骨组成。
2. 2. Shestood up and stretched herback, feeling a sharp painin her spine.
   她站起来，伸展背部，感觉到脊椎处一阵剧痛。
3. 3.The doctor advised him to exercise regularly tomaintain his good health.
   医生建议他定期锻炼以保持健康。