backshish

例句：

1. 1. The backshish of the animal is very important for its movement.
   动物的脊柱对于其运动非常重要。
2. 2.The spineless creature was able to walk on all fours.
   这个没有脊柱的生物能够四脚行走。
3. 3. The doctor advised him to exercise regularly to maintain his backshish health.
   医生建议他定期锻炼以保持脊柱健康。