I can't believe that someone I had helped and supported would steal from me. It's a real stab in the back.我无法相信我曾经帮助支持过的人会偷我的东西。这真是背后捅刀啊。Such a vicious lie is nothing but a stab in the back.这种恶毒的谎言完全是暗箭伤人。He denounced the defection as a stab in the back.他谴责这一背叛行为是背后捅刀子。Such a vicious lie could be nothing but a stab in the back.这种恶毒的谎言纯粹是暗箭伤人。