The footfall was an uncertain and shuffling one.

脚步声慢吞吞地，象是拖着步子在走。

What matter it though life uncertain be to all?

何必去管它，人生总是无定？

Meanwhile, the protests' political effect seems very uncertain.

同时，抗议者们的政治作用似乎很不确定。

We may leave our partner uncertain where they stand or deeply aware of their inadequacies.

我们让伴侣不知所措　或是不断让他知道自己的缺陷。

They are more fallible, it's definitely an uncertain time.

他们更容易犯错误，这是一个不确定的时代。

He made uncertain movements, because everything in his head was vague and uncertain.

他茫然地走来走去，因为他脑子里的一切都是模糊而不确定的。

Since the inputs into our models are uncertain, naturally, their outputs will be uncertain too.

由于我们模型的输入是不确定的，自然地，它们的输出也是不确定的。

Whether all this ingenuity unravels any cosmic truth is uncertain.

所有这种独出心裁是否能解开宇宙的真相，还不确定。

The future of the ISS is uncertain.

国际空间站的未来是不确定的。

Being confused and uncertain around such concepts.

混淆和周围这样的概念不确定性。