betray one's country;turn traitor to one's country;commit treason;betrayal;quisle ;

This strange act of treason was of course a fine intelligence break for us.
这种奇特的叛国行为,对我们来说,当然是一次幸运的获得情报的机会.
来源:词典精选例句It's bad judgment, but it's not treason. I think treason is too strong a word.
这是一次判断失误,但不是叛国。我认为说叛国太过了。
来源:《柯林斯高阶英汉双解学习词典》
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