polycheiria

例句：

1. 1. Thepolypody is a fascinating group ofanimals that can change their shape to fittheir environment.
   多足纲是一组令人着迷的动物，它们可以改变形状以适应环境。
2. 2. The polypody has beenstudied for its unique adaptations to extremeenvironments.
   多足纲因其对极端环境的特有适应而受到研究。
3. 3. The polypody plays an important role in the ecosystem, as they are predators and prey for many other species.
   多足纲在生态系统中扮演重要角色，它们是许多其他物种的捕食者和猎物。