traitor

/ˈtreɪtər/

someone who betrays his country by committing treason

中文释义：叛徒；背叛者

The soldier was executed after being found guilty of being a traitor.

这名士兵被判犯有叛国罪后被处决。

In the novel, the protagonist discovers that his closest friend is a traitor.

在小说中，主人公发现他最亲密的朋友是个叛徒。