He is an unknown quantity for his rivals.

对于对手们而言，他是个未知数。

柯林斯例句

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.

《简明英汉词典》

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

约翰可能获得这工作但(能否获得)现在还是个未知数.

辞典例句

The new sales director is still a bit of an unknown quantity.

新来的销售部主任大家还不大了解.

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His ability to make decisions in a crisis is an unknown quantity.

他在危机中作决定的能力还是个未知数.

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Garlic to me is an unknown quantity.

我从不吃大蒜.

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Our new director is still an unknown quantity.

我们对新来的主管知之甚少.

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What we would find if we could fly to the moon is an unknown quantity.

如果我们能飞到月球上去,在那里我们将会发现什么,这是很难以预料的.

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I don't know what the new man will do; he's still an unknown quantity.

我不知道那个新来的会怎么做, 他的人怎样仍然是个未知数.

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Debrecen were an unknown quantity and they played very defensively, which is their right.

赛前谁都不知道德布莱森的实力,他们也踢的很有侵略性, 这是他们正确的选择.

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