2 sentences

1. 人体的脊柱由许多块椎骨组成。

   rén​tǐ de jǐ​zhù yóu xǔ​duō kuài zhuī​gǔ zǔ​chéng.

   The human spine is made up of many vertebrae.

   Source: Dong Chinese Dictionary

2. 保持正确的坐姿可以减轻脊柱的压力。

   bǎo​chí zhèng​què de zuò​zī kě​yǐ jiǎn​qīng jǐ​zhù de yā​lì.

   Maintaining correct posture can reduce pressure on the spine.

   Source: Dong Chinese Dictionary