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Cold case
01
冷案, 未决案件
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.
侦探被指派到冷案单位，专注于多年来未决、没有最新调查线索的犯罪案件。
Advances in DNA technology have recently helped solve many cold cases that were previously considered unsolvable.
最近，DNA技术的进步帮助解决了许多以前被认为无法解决的冷案，未决案件。
