You must eliminate an unknown quantity.
你必须消去一个未知数。
To remove(an unknown quantity)by combining equations.
消去通过等式合并消去（一个未知量）
The words "less 3" tell us to subtract three from the unknown number.
“减去3”这几个字，告诉我们将从一个未知数中减去3。
The sign X stands for an unknown number.
符号X表示一个未知数。
A quantity of unknown numerical value.
未知数数值不明的一个数量
The past one can know, but the future one can only feel.
一个人可以明知过去，但只能感悟未来。
We use x as the symbol for an unknown quantity.
我们用ｘ表示一个未知数。
No one knows if it can grow healthily.
它们能否稳健成长，是一个未知数。
A data error has occurred. The interface type is unknown.
发生了一个数据错误。界面类别未知。
No, everything is up in the air.
不知道，一切都是未知数。
Why should I throw note after maybe something not known?
明天是一个未知数，为什么要把今天的精力浪费在未知的事上？
She disappeared and was never heard of again.
她不知去向了，再未听到她的消息。
x and y are unknowns.
x和y 代表两个未知数.
An interval estimation of unknown parameter p in negative binomial distribution
负二项分布中未知参数p的一个区间估计
A system with as many equations as unknowns will be consistent.
一个方程数和未知量数一样多的方程组将是相容的。
Oh, I love someone, but it's still uncertain whether we could live together in future.
噢,我爱一个人,但是将来能不能与她生活在一起,这还是个未知数.
an unknown and unexplored region.
一个未知的和未经勘察的区域。
I have a had announcement to make.
下面我通知一个坏消息。