too good to be true idiom
好得令人难以置信
so good that it is hard to believe, or seeming very good but not real
Her new job sounds too good to be true. 她的新工作听上去好得令人难以置信。
I'm not surprised the offer wasn't genuine, it sounded too good to be true. 这个报价不是真的我并不奇怪，因为它实在好得令人难以置信。