cold case
US /ˈkoʊld keɪs/
UK /ˈkoʊld keɪs/

名词
1.
悬案, 未侦破案件
an unsolved criminal investigation that has been closed but could be reopened if new evidence emerges
示例:
•
Detectives reopened the cold case after a new witness came forward.
一名新证人出现后,侦探们重新启动了这起悬案。
•
The documentary explored several famous cold cases.
这部纪录片探讨了几起著名的悬案。
在 Lingoland 学习这个单词