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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.
例句
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.
解开现代灵性之谜的故事