两个家族之间的世仇用英语怎么说？

两个家族之间的世仇

a feud between two families

feud

n. 不和，世仇，封地；vi. 长期不和，经常争吵；

例句
...a long and bitter feud between the state government and the villagers.
州政府和村民间的久积深怨

between

prep. 在…之间，私下，暗中，在…中任择其一，来往于…之间；adv. 当中，中间；

例句
How big is the abyss between what you think you are and what you actually are?
你对自己的认识和真实的你之间差别到底有多大？

two

n. 两个，两个东西，两点钟，一对；adj. 两个的，我

例句
He has been absent from his desk for two weeks...
他已经有两个星期没有坐在办公桌前了。

families

n. 家( family的名词复数 )，家族，（大）家庭（包括父母子女及近亲），语族；

例句
We have been working very hard, and our families have also worked hard...
我们一直很努力工作，并且我们的家人也是如此。