a factor in a given situation whose bearing and importance is not apparent;
"I don't know what the new man will do; he's still an unknown quantity"
a variable whose values are solutions of an equation
例句
词汇搭配
例句
The new teacher is still very much an unknown quantity but we have hopes that he will be a valuable member of our team. 新教师是谁现在还难以预料,但我们希望他会成为我们队里的重要一员。
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。