an intricate case without a clue; an unsolved mystery ? 經(jīng)過一年的調(diào)查那件謀殺案仍然是一樁~。After one year’s investi gation the murder remains an unsolved mystery.
無頭公案wu tou gong an
case without clues
無頭公案wu tou gong an
case without clues
無頭公案
intricate case without a clue
無頭公案wú tóu ɡōnɡ àn
指無法破的案子。a mystery case without clues, an unsolved mystery