known unknowns
已知的未知
以上为机器翻译结果，长、整句建议使用 人工翻译 。
We also know There are known unknowns.
我们也知道，有些是已知的不知。
youdao
In the forecasting business, "known unknowns" are called uncertainties.
在预测行业里面，“已知的未知数”被称作不确定性。
It's extremely hard to prepare for the known unknowns until you take them seriously.
为已知的未知事件做准备相当困难，除非你重视他们。
But it's a reminder that the 'known unknowns' in the Spanish case are mainly local.
BBC: Eurozone crisis: what have we learned?
Some of these novel branches were, nevertheless, similar enough to known branches to be accounted for as known unknowns.
ECONOMIST: A new domain of life
These are just some of the many known unknowns, admits Tsuga, who will keynote at the Consumer Electronics Show in January.
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