这句话可以用 "That's too good to be true." 来表达。

"Too good to be true" 是一个习惯用语，意思是某事物如此美好，以至于不可能是真的。这个短语来源于古英语中的 "Godes tydinges be Godes lyg"，意思是上帝的好消息不可能是谎言。

例句:

I heard that I won the lottery, but it seems too good to be true.
She said she would pay me back all the money, but it's too good to be true.
He told me he would take care of everything, but it's too good to be true.

中文翻译:

我听说我中了彩票, 但这似乎太好了, 不可能是真的.
她说会把所有的钱还给我, 但这太好了, 不可能是真的.
他告诉我会处理所有事情, 但这太好了, 不可能是真的.