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。
If so, they might do worse than plump for Mitt Romney, a former governor of Massachusetts and a primary candidate last time: a known quantity with what looks like a safe pair of hands.
如果是这样，他们就应该[注2]支持米特·罗姆尼，他是马萨诸塞州的前州长，上一次大选也参加了共和党初选，是大家熟知的竞选人，而且看上去办事牢靠[注3]。
This found that if the reverse idea of the electron charge-mass ratio as a known quantity, it can re-theoretical derivation, and thus obtain the value of the vacuum in the speed of light.
笔者发现，如果进行逆向构思，把电子的荷质比作为已知量时，可重新进行理论推导从而得到真空中的光速值。
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