N-COUNT [usually singular]难解之谜;费解的事;费解的人 If you describe something or someone as an enigma, you mean they are mysterious or difficult to understand. 难解之谜;费解的事;费解的人
Iran remains an enigma for the outside world.
对于外界而言,伊朗仍是个谜。
...a story which makes clear the modern enigma of spirituality.