yí'àn

mystery

疑案 yí'àn
mystery noun
a controversial or suspicious matter that is open to debate and lacks a definitive explanation
unsolved case noun
a criminal or legal case that remains unresolved due to a lack of evidence or clarity

Frequency

Movie subtitles
0.360 per million appears in 0% of films
Written text
0.328 per million

Sources

Definitions
CC-CEDICT