The sign X denotes an unknown number.
符号表示一个未知数。
The sign X stands for an unknown number.
在代数中，符号x通常代表一未知数。
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 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。
When most of us get a text message on our cell phone from an unknown person, we usually say "sorry, wrong number!"
当我们收到陌生人的短信时,我们通常会说：“对不起, 你发错了！”
The exact number of victims is unknown.
目前受害者确切数字无法得知。
The exact number of cases and deaths is unknown at this time.
确切的病例数和死亡人数此时尚不可知。
Singulars are infinite in number, and the infinite as such is unknown.
个体的数量是无限的，而这种无限则是无从认识的。
The number of people present at meeting is unknown.
出席会议的人数还不知道。
The fundamental cause is unknown, though a number of predisposing conditions are recognized.
虽然研究者们已经发现了很多相关的发病因素，但其发病机制仍不清楚。
Used to treat a number of diseases of unknown or autoimmune cause.
用于一系列的不明或自体免疫疾病。
Used to treat a number of diseases of unknown or autoimmune cause.
用于一系列的不明或自体免疫疾病。
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