1.
You must eliminate an unknown quantity.
你必须消去一个未知数。
2.
To remove(an unknown quantity)by combining equations.
消去通过等式合并消去（一个未知量）
3.
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。
4.
The sign X stands for an unknown number.
符号X表示一个未知数。
5.
A quantity of unknown numerical value.
未知数数值不明的一个数量
6.
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。
7.
We use x as the symbol for an unknown quantity.
我们用ｘ表示一个未知数。
8.
No one knows if it can grow healthily.
它们能否稳健成长，是一个未知数。
9.
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。
10.
No, everything is up in the air.
不知道，一切都是未知数。
11.
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？
12.
She disappeared and was never heard of again.
她不知去向了，再未听到她的消息。
13.
x and y are unknowns.
x和y 代表两个未知数.
14.
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
15.
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。
16.
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.
17.
an unknown and unexplored region.
一个未知的和未经勘察的区域。
18.
I have a had announcement to make.
下面我通知一个坏消息。