1. 缺点;瑕疵;弱点
    A vice is a habit which is regarded as a weakness in someone's character, but not usually as a serious fault.

    e.g. His only vice is to get drunk on champagne after concluding a successful piece of business...
           他唯一的缺点就是在成功做成一笔生意后会大喝香槟而醉。
    e.g. Intellectual pretension was never one of his vices.
           他从来不附庸风雅。

2. （尤指与色情业、卖淫行为相关的）犯罪活动,恶行
    Vice refers to criminal activities, especially those connected with pornography or prostitution.

vice的近义词

    e.g. He said those responsible for offences connected with vice, gaming and drugs should be deported on conviction.
           他说，那些被指控与卖淫、赌博和吸毒有关的人一旦罪名成立就应该被驱逐出境。
    e.g. ...allegations of how she worked in a 'seedy vice den'.
           对她在“肮脏淫窝”里如何工作的说法

3. 老虎钳;台钳
    A vice is a tool with a pair of parts that hold an object tightly while you do work on it.