gnathopod

例句：

1. 1. The octopus is a common species in the ocean.
   章鱼是海洋中常见的物种。
2. 2. Many scientists study the behavior of cephalopods.
   许多科学家研究头足纲动物的行为。
3. 3.The octopus has eight arms and can change its shape to fit its environment.
   章鱼有八条触手，可以改变形状以适应环境。