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1·X and Y in the equation are both unknowns.

等式中的X和Y都是未知数。《牛津词典》

2·The length of the war is one of the biggest unknowns.

战争的持续时间是其中一个最大的未知数。《柯林斯英汉双解大词典》

3·There are so many unknowns in the proposal.

这项提案中的未知数太多了。《牛津词典》

4·Within a short space of time a group of complete unknowns had established a wholly original form of humour.

在短短的一段时间内，一群完全不为人知的人已始创了一种新式幽默。《柯林斯英汉双解大词典》

5·One equation with two unknowns.

一个方程两未知数。

6·There are still more unknowns.

还有更多的未知因素。

7·Two equations with two unknowns.

两方程的两未知数。

8·Palin and Huckabee are the unknowns.

佩林和赫卡比还是未知数。

9·There are still too many unknowns.

依然有太多的不确定性。

10·So take an example: 2 equations 2 unknowns.

所以，让我们来举一个例子：两个方程两个未知数。