How much do we know about love?

我们又对爱情了解多少？

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So how much do we know?

那么我们究竟知道多少？

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It isn't actually known how many sites there are across Australia where rock art can be found—but unfortunately, we do know that much of the art is being lost to us.

目前还不知道在澳大利亚有多少地方能够发现这种岩石艺术；但不幸的是，我们知道有很多艺术作品正在消失。

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But that formulation seems in many ways to be question begging. How much precision does the subject allow? How do we know?

所允许之外的精准,但这样的逻辑本身即,在很多方面启人疑窦？

耶鲁公开课 - 政治哲学导论课程节选

But how much do we really know about the molecule that makes life possible?

FORBES: The Story Of Eau

But how much do we really know about adoption and the long-term efficacy of clean cook stoves?

FORBES: Where There's Smoke, There's Fire: A Call to Action for Better Indoor Air Pollution Research

But how much do we actually know about how colds and flu spread - for example how many others does one cold sufferer infect?

BBC: Colds and flu remain mysterious