世界上有已知的未知，也就是说我们知道我们还不知道的那些事情。
There are known unknowns. That is to say there are things that we now know we don't know.
我们也知道还有一些已知的未知，也就是说我们知道自己还有一些不知道的事情。
We also know there are known unknowns; that is to say we know there are some things we do not know.
客观的不确定性关乎唐纳德·拉姆斯菲尔德(在另一种语境中)提及的“已知的未知方面”。
Objective uncertainty is about what Donald Rumsfeld (in a different context) referred to as the "known unknowns".
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