Nemertea

例句：

1. 1.The jellyfish is a common sight in the ocean.
   海蜇是一种常见的海洋生物。
2. 2.The octopus has eight arms and can move very quickly.
   章鱼有八条触手，移动非常迅速。
3. 3.The water snail lives in freshwater habitats and is known for its ability to regenerate lost limbs.
   水蜗牛生活在淡水环境中，以其再生失去肢体的能力而闻名。