无头案 (mó) — unsolved mystery, unsolved case

Definition

Examples

• 这起案件成了无头案，警方至今没有找到凶手。
  Zhè qǐ àn jiàn chéng le mó, jǐng fāng zhì jīn méi yǒu zhǎo dào xiōng shǒu.
  This case became an unsolved mystery; the police still haven't found the murderer.
• 关于那个古老的无头案，有很多传说。
  Guān yú nà ge gǔ lǎo de mó, yǒu hěn duō chuán shuō.
  There are many legends about that ancient unsolved mystery.
• 这个无头案困扰了历史学家几十年。
  Zhè ge mó kùn rǎo le lì shǐ xué jiā jǐ shí nián.
  This unsolved mystery has puzzled historians for decades.