小鳍

例句：

1. 1. The fish swims with its small fin.
   这条鱼用它的小鳍游动。
2. 2. The little fishis swimming in the river.
   这条小鱼正在河里游。
3. 3. The fisherman uses a netto catch small fish.
   渔夫使用网来捕捉小鱼。