In math, X is used to stand for an unknown number.
在数学中，X被用来代表一个未知数。
The sign X stands for an unknown number.
在代数中，符号x通常代表一未知数。
The unknown number can be calculated from the data.
通过已知数可以算出未知数。
Write out the equality that contains unknown number.
列出含有未知数的等式。
They have an unknown number of binary digits, which you cannot control.
他们有数目不详的二进制数字，你无法控制。
If you want to get the unknown number, you should know the known number first.
如果要想求出未知数，你首先得知道已知数。
Haiti has been struck by a 7.0 earthquake, killing an unknown number of people.
海地今晨发生7.0级大地震，目前死亡人数尚无统计。
Haiti has been struck by a 7.0 magnitude earthquake, killing an unknown number of people.
海地今晨发生7.0级大地震，目前死亡人数尚无统计。
Haiti has been struck by a 7.0 magnitude earthquake, killing an unknown number of people.
海地今晨发生7.0级大地震，目前死亡人数尚无统计。
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