1、Finn and Jake are the main characters in the animated TV series "Adventure Time".
芬恩和杰克是动画片《冒险时间》中的主要角色。

2、We decided to go fishing in a small finn.
我们决定在一艘小船上去钓鱼。

3、The dolphin swam gracefully, its finn cutting through the water.
海豚优雅地游过，它的鳍在水中切割着。