That's great for the fish population and the river otters that live here.

这对鱼及在这里生活的人们都很有帮助。

So say your state has a lot of turkeys but no river otters, you find a state that has a lot of otters and needs turkeys, and you trade.

假设你的州有很多火鸡但没有水獭 你发现一个有很多水獭的州需要火鸡 然后你进行贸易。