1. 未知量：unknown number 未知数 | unknown quantity 未知量 | unknown term 未知项
2. 未知：unknown number 未知 | unknown quantity 未知 | unlike fractions 分母分
3. 未知量,未知数：unknown pulse ==> 未知脉冲 | unknown quantity ==> 未知量,未知数 | unknown solution ==> 未知液
1. It was carrying an unknown quantity of dimethyl sulfate, a corrosive chemical used to produce industrial dyes and pesticides.
2. But on that early spring evening in London, it was still a completely unknown quantity.