a bone of contention
US /ə ˌboʊn əv kənˈten.ʃən/
UK /ə ˌboʊn əv kənˈten.ʃən/

成语
1.
争论的焦点, 争执的根源
a subject or issue over which there is continuing disagreement
示例:
•
The division of assets became a bone of contention during the divorce proceedings.
资产分割在离婚诉讼中成了争论的焦点。
•
The new parking policy has been a bone of contention among residents.
新的停车政策一直是居民们争论的焦点。
在 Lingoland 学习这个单词