a feud between two families的用法和样例：
- A feud between two families or clans that arises out of a slaying and is perpetuated by retaliatory acts of revenge; a blood feud.
- A feud between two houses Montague and Capulet.
- Turkish Interior Minister Besir Atalay said it was thought to stem from a feud between two local families.
- There was a blood feud between the two families.