amphistome

例句：

1. 1. The amphistomes are a group of animals that can breathe both air and water.
   无鳍鱼是一种可以同时呼吸空气和水的鱼类。
2. 2. The amphistomes have evolved to live in different environments.
   无鳍鱼已经进化成适应不同环境生活的生物。
3. 3. The amphistomes play an important role in the ecosystem.
   无鳍鱼在生态系统中扮演着重要的角色。