疑案 (yí àn) — unsettled legal case; mystery; puzzling matter

Definition

Examples

• 这起疑案已经调查了三年，至今没有结果。
  Zhè qǐ yí àn yǐ jīng diào chá le sān nián, zhì jīn méi yǒu jié guǒ.
  This unsettled case has been investigated for three years and still has no result.
• 侦探小说里总是充满各种疑案。
  Zhēn tàn xiǎo shuō lǐ zǒng shì chōng mǎn gè zhǒng yí àn.
  Detective novels are always full of various mysteries.
• 他的失踪成了一桩疑案，至今无人能解。
  Tā de shī zōng chéng le yì zhuāng yí àn, zhì jīn wú rén néng jiě.
  His disappearance became a mystery that no one has been able to solve to this day.