too good to be true
US /tuː ɡʊd tə bi truː/
UK /tuː ɡʊd tə bi truː/

1.
好得令人难以置信, 难以置信
so good as to be unbelievable; highly unlikely
:
•
The offer for a free vacation seemed too good to be true, and it was a scam.
免费度假的提议似乎好得令人难以置信,结果是个骗局。
•
When something sounds too good to be true, it usually is.
当某事听起来好得令人难以置信时,通常就是如此。