1. 谜;神秘的事物;难懂的事物
    A mystery is something that is not understood or known about.

    e.g. The source of the gunshots still remains a mystery.
           枪炮声来自何处仍是个谜。
    e.g. ...the mysteries of mental breakdown.
           精神崩溃之谜

2. 神秘；谜一样的特质
    If you talk about the mystery of someone or something, you are talking about how difficult they are to understand or know about, especially when this gives them a rather strange or magical quality.

    e.g. She's a lady of mystery...
           她是个神秘的女人。
    e.g. It is an elaborate ceremony, shrouded in mystery.
           仪式是精心筹划的，笼罩着一层神秘的色彩。

3. 神秘的;身份不明的
    A mystery person or thing is one whose identity or nature is not known.

    e.g. The mystery hero immediately alerted police after spotting a bomb.
           那个无名英雄发现炸弹后马上报了警。
    e.g. ...a mystery prize of up to £1,000.
           高达1,000英镑的神秘奖品

4. 疑案小说;推理小说
    A mystery is a story in which strange things happen that are not explained until the end.

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    e.g. His fourth novel is a murder mystery set in London.
           他的第四部小说讲述的是一起发生在伦敦的神秘谋杀案。