Did it really happen or did I just dream it?

这是真的吗？还是我在做梦？

《牛津词典》

Oh, really?; What? Is that true?

呣， 是真的吗?

《新英汉大辞典》

"We discovered it was totally the wrong decision."—"Really?"

“我们发现那完全是个错误的决定。”—“真的吗？”

《柯林斯英汉双解大词典》

Now we can't neglect the first question here, which is at least for me: did Milton really believe this?

现在至少对我来说，我们不能忽略一个问题：,弥尔顿真的信这个吗？

耶鲁公开课 - 弥尔顿课程节选

or "Oh, really?" and not say, "Well, that's rubbish, isn't it?"

或者“哦，真的吗？”，而不会说，“天啦，真是垃圾。不是吗？”

认识戈登•拉姆齐吗？ - SpeakingMax英语口语达人

And eventually,we'll turn to some other value questions about if death really is the end, should we be afraid of death?

最终，我们会转向其他的关于价值的问题，比如如果死亡真的是终结，我们应该害怕吗？

耶鲁公开课 - 死亡课程节选