背甲

例句：

1. 1. The turtle has a hard shell on its back.
   乌龟有背上的硬壳。
2. 2. The lion's mane is made up of many small hairs that form a protective layer on its back.
   狮子的鬃毛是由许多小毛发组成的，形成其背部的保护层。
3. 3. She wore a leather jacket with a back zipper for added security.
   她穿着一件带有后拉链的皮夹克以增加安全性。