In China, just as in the West, there is a strong public fascination with mysteries and justice. The term `悬案` frequently appears in media, fueling a genre of true crime books, documentaries, and TV dramas. Famous historical `悬案`, such as the mysterious death of Lao She or the Nanjing University dismemberment case (南大碎尸案), become part of the collective memory, debated and discussed for decades. A useful comparison is to the American term “cold case.” In a legal context, they are nearly identical. However, `悬案` has a broader, more philosophical application. While you wouldn't call a debate over a sports rule a “cold case,” you might hear a long-standing historical or political dispute, like the exact circumstances surrounding a dynastic collapse, referred to as a “历史悬案” (lìshǐ xuán'àn - a historical unresolved case). This reflects a cultural perspective that sees history and politics as grand narratives with complex, lingering questions that, like a criminal case, demand truth and resolution. The term carries a weight of history and a yearning for closure that a simple “unsolved problem” lacks.
`悬案` is most commonly encountered in formal or semi-formal contexts.