traitor /ˈtreɪtə/ TEM4

• 1. 

  N-COUNT 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. 背叛者 [表不满]

  例：

  Some say he's a traitor to the peace movement.

  一些人说他是和平运动的背叛者。

• 2. 

  N-COUNT If someone is a traitor, they betray their country, friends, or a group of which they are a member by helping its enemies, especially during time of war. (尤指战争期间的) 卖国贼; 叛徒

  例：

  ...rumours that there were traitors among us who were sending messages to the enemy.

  …谣言说我们中有正给敌人送信的叛徒。