1. He was denounced as a traitor to his country.
    他被指责为卖国贼。

2. He turned traitor to our cause.
    他背叛了我们的事业。

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1. 背叛(信仰)者;背信弃义者
    If you call someone a traitor, you mean that they have betrayed beliefs that they used to hold, or that their friends hold, by their words or actions.

    e.g. Some say he''s a traitor to the working class.
           一些人说他是工人阶级的叛徒。

2. (尤指战时的)卖国贼，叛徒
    If someone is a traitor, they betray their country or a group of which they are a member by helping its enemies, especially during time of war.

    e.g. ...rumours that there were traitors among us who were sending messages to the enemy.
           关于我们中间有叛徒向敌人通风报信的传言

1. a person who says one thing and does another

    Synonym: double-crosserdouble-dealertwo-timerbetrayer

2. someone who betrays his country by committing treason

    Synonym: treasonist