全部

1·She had known Max for some years now, but he was still pretty much an unknown quantity.

她现在认识马克斯也好几年了，但是他仍然是个大大的未知数。《柯林斯英汉双解大词典》

2·Are an unknown quantity.

对于他们来说是一个未知的组合。

3·In algebra, the sign X usually denotes an unknown quantity.

在代数里，符号X常用来表示未知数。

4·John is a possibility for the job, but he is still an unknown quantity.

约翰可能获得这工作但现在还是个未知数。

5·Mary is a possibility for the position, but she is still an unknown quantity.

玛丽可能获得这工作，但(能否获得)现在还是个未知数。

6·The Frenchman was an unknown quantity when he arrived in north London back in 1996.

1996年，当他初到北伦敦时，这个法国人还只不过是个未知数而已。

7·Youth is the smile of the future in the presence of an unknown quantity, which is itself.

青春就是未来在向一个陌生人微笑，而这陌生人就是自己。

8·Because he's been sheltered from publicity, William is very much an unknown quantity to most of his future subjects.

由于威廉一直避开宣传，他未来的臣民大都对他实在不甚了解。

9·Woodstock for them is only a picture in their textbooks, the Chicago Seven (or was it Eight?) are an unknown quantity.

伍德·斯托克对于他们来说只是教材里的一张图片，芝加哥七人(又或者是八人？)对于他们来说是一个未知的组合。

10·Additionally, an unknown quantity of methane in the form of hydrates (or clathrates) lies trapped beneath the polar sea floors.

此外，未知数量的甲烷以水合物(或气水化合物)的形式被困在极地海洋海底之下。