rufin

例句：

1. 1.The fish has a beautiful fin on its back.
   这条鱼背部有美丽的鳍。
2. 2.The fisherman used his net to catch the fish.
   渔夫用网捕捉了这条鱼。
3. 3.The fish was swimming gracefully in the water.
   这条鱼在水中游动得非常优雅。