脊椎弯曲

例句：

1. 1. The spine of the bird is curved like a shield.
   鸟的脊柱像盾牌一样弯曲。
2. 2. The spine of the book is very thin and fragile.
   这本书的脊骨非常薄且易碎。
3. 3. The spine of the animal is made up of many bones.
   动物的脊骨由许多骨头组成。