背信者

例句：

1. 1.He was a backstabber whobetrayed his friends.
   他是一个背信弃义的人，背叛了他的朋友。
2. 2. The company's reputation suffered due to the backstabbing behavior of its employees.
   由于员工的背信弃义行为，公司的声誉受到了损害。
3. 3. In the old days, peopleused to call someone a backstabber if they were suspected of betraying their trust.
   在旧时代，如果有人被怀疑背叛了信任，人们会称他们为背信弃义者。