bone of contention
成語所屬單字contention
bone of contention — 慣用語
1. a subject or issue that two or more people or groups keep arguing about over a l
1.慣用語
釋義
爭執的焦點；爭議點
a subject or issue that two or more people or groups keep arguing about over a long period
例句
The ownership of the land has been a bone of contention between the two families for generations.
Working hours became the main bone of contention during the contract negotiations.