对于他们来说是一个未知的组合。
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。
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。
We are facing an unknown purpose unknown quantity.
们常常是对着一个未知数而前进。
We are facing an unknown purpose unknown quantity.
们常常是对着一个未知数而前进。
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