pereopod

例句：

1. 1. Thecrab has two pereopods oneach leg.
   螃蟹每条腿都有两个腿节。
2. 2. The scientist observed the animal's movements with a microscope.
   科学家用显微镜观察动物的动作。
3. 3. The fish swims usingits four pereopods to propel itself forward.
   这条鱼使用它的四条腿来推动自己前进。