rachides

例句：

1. 1.The snail slowly moves along the shell.
   蜗牛慢慢地沿着壳移动。
2. 2.The slug is a common insect that feeds on decaying organic matter.
   蛞蝓是一种常见的昆虫，以腐烂的有机物质为食。
3. 3. Snails are known for their ability to adapt to various environments.
   蜗牛因其适应各种环境的能力而闻名。