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Palin and huckabee are the unknowns .

佩林和赫卡比还是未知数。

Today we have new uncertainties . I made a quick list of current known unknowns in my own mind .

如今我们有了新的不确定性，关于当下的已知未知数在我的脑海里列了一张快速名单。

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。

Amid the unknowns , the nearest thing to a certainty was that the war would end as messily as it began , with no clear win for either side .

在这些未知数中，最确定的一件事情就是同其开端一样，这场战争将结束于一团混乱之中，没有一方能明显获胜。

However , there are still many unknowns surrounding the safety and effectiveness of that strategy .

然而，关于此道的安全性与有效性仍有许多未知数。