an unsolved case
悬案
以上为机器翻译结果，长、整句建议使用 人工翻译 。
BJ: Memories of Murder is obviously an unsolved case, and it ends with the fact that you can’t know the killer at the end. It’s a mystery film that ends with a mystery.
奉：《 杀人回忆》显然是未解之案，直到影片结束你也不知道凶手到底是谁，这是一部以悬念结尾的悬疑片。
youdao
Applied to an unsolved case of mass murder, it sounds wrong.
ECONOMIST: The fine line between disagreement and propaganda
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