The letter "x" often represents an unknown number in some Math exercises.
在一些数学练习中，字母“x”通常代表一个未知数。
A couple of hours after I left the comment, I got a text message from an unknown number.
我评价过后几个小时，收到了一个陌生号码的信息。
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。
As Tzu Chi volunteers lead a mass prayer, everyone puts their palms together to pray for safety and wellbeing not only for themselves, but also for the unknown number of victims out there.
慈济志工带著灾民一起祈祷，每个人双手合十，不只是为自己，也是为其他受苦受难的人民祈祷平安。
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。
The toll climbed to as many as 155 dead, with more than 500 wounded and an unknown number still missing.
遇难人数已上升到155人，500多人受伤，还有人数不详的失踪者。
The GWM model for splice signals is a mixture of weight matrix models (WMM) with unknown number of components.
分组权重矩阵是一个子总体数未知的混合权重矩阵模型。
Finally, simulation proves the capacity to perform the blind source separation with an unknown number of sources and the convergent stability of the new algorithm.
新算法具有与自然梯度算法相同的收敛速度，而且克服了已有算法不能稳定收敛的缺点。仿真验证了新算法的分离性能和收敛稳定性。
Finally, simulation proves the capacity to perform the blind source separation with an unknown number of sources and the convergent stability of the new algorithm.
新算法具有与自然梯度算法相同的收敛速度，而且克服了已有算法不能稳定收敛的缺点。仿真验证了新算法的分离性能和收敛稳定性。
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