How do you deal with unknown unknowns in architecture?

您如何应对架构中的这些未知的未知数呢？

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Investors face a world marked by "known and unknown unknowns", in the words of Donald Rumsfeld, a former American defence secretary.

用美国前防长拉姆斯·菲尔德的话来讲，投资者身处一个“已知的未知和未知的未知”的世界。

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And as the unknown unknowns have turned into known unknowns, the system has been experiencing postmodern bank runs.

伴随着未知的未知转变为已知的未知，金融体系正在经历后现代主义版本的银行挤兑风潮。

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As Donald Rumsfeld might have put it, they have left a world of known unknowns for a twilight landscape of unknown unknowns.

ECONOMIST: Financial markets

Then there are the unknown unknowns, as former Defense Secretary Donald Rumsfeld might say.

FORBES: Spending

Johnson said it is impossible to guard against all "unknown unknowns, " and that's why strong security is needed at venues.

CNN: London's Olympic security headache