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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·We are facing an unknown purpose unknown quantity.

们常常是对着一个未知数而前进。

4·To her the outside world was a totally unknown quantity.

对她来说，外部世界完全是个未知数。

5·Unknown Quantity: a Real and Imaginary History of algebra.

《隐蔽的数量：代数的真实和想象的历史》。

6·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。

7·To shanti the outside world was a totally unknown quantity.

对尚蒂来说外面的世界完全是个未知数。

8·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。

9·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。

10·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。