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Cold case
01
未解決事件 (みかいけつじけん), 冷たい事件 (つめたいじけん)
a criminal investigation that has remained unsolved for a significant period and lacks recent investigative leads
Example
The detective was assigned to the cold case unit, focusing on unsolved crimes that had gone inactive for years.
探偵は未解決事件ユニットに配属され、長年解決されていない犯罪に焦点を当てた。
Advances in DNA technology have recently helped solve many cold cases that were previously considered unsolvable.
最近のDNA技術の進歩は、以前は解決不可能と見なされていた多くの未解決事件の解決に役立ちました。
