The price of the car is too good to be true. There must be something wrong with it.这辆轿车的价格低得令人难以置信，里面一定有什么问题。

If it looks/seems too good to be true, it probably is. [=there is probably some cost or bad part you do not know about]如果看起来好得令人难以置信，那就很可能有猫腻。