cold case

noun
🔊/ˈkəʊld keɪs/
🔊/ˈkəʊld keɪs/
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  1. a crime that has not been solved and remains open to investigation if new evidence is found
    • Britain is becoming a leader in solving cold cases, thanks to its national DNA database.得益于其国家DNA数据库,英国正成为解决感冒案件的领导者。