词汇与表达：treacherous-deceit-betray

If you describe someone as treacherous, you mean that they are likely to betray you and cannot be trusted.
He publicly left the party and denounced its treacherous leaders...
他公开脱离该党，并谴责该党领袖背信弃义。

He was weak, cowardly and treacherous.
他软弱、胆怯、奸诈。

Her ethics would never allow her to betray a friend.
她的伦理观不容许她背叛朋友。

He was deeply wounded by the treachery of close aides
他被亲密助手的背叛深深地伤害了。