an act of treachery

• 背叛行为

an act of treachery的用法和样例：

例句

1. Because treachery can't be forgiven.
   因为背叛行为是不可宽容的。
2. This was a treacherous act of betrayal by the Irish.
   这是爱尔兰人可耻的背叛行为。