We really don't know.

我们真的不知道。

youdao

We really don't know a lot about how long a wood frog normally lives, probably just a few years but there is no evidence its longevity.

对于一只树蛙通常能活多久，我们确实知道得不多，可能只有几年，但没有证据表明它能长寿。

youdao

But we really don't know what you're talking about.

但是我们不明白你在讲什么？

youdao

"What we know from research on teen brain development, is that teens don't really have fully developed brains until they're twenty-five years old.

VOA: special.2010.07.01

if we can't think what system it belongs to, that's tantamount to saying we really don't know what it is.

我们就不知道它从属于哪个符号系统，我们就不能认识它了。

耶鲁公开课 - 文学理论导论课程节选

We really don't know, but it has something to do with "being."

我们并不知道，但它是与某种存在有关系的“

耶鲁公开课 - 旧约导论课程节选

We really don't know too much about the situation of the poor in Angola today.

CNN: Opinion: Is oil-rich Angola a development success?

We really don't know what sort of composition a planet the size of Kepler-22b would have.

BBC: Viewpoint: The obsession with a 'twin Earth'

But we really don't know what we can do until we stand up and try.

WHITEHOUSE: It's Work Creating Jobs, But It's Worth It