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。
The sign X stands for an unknown number.
在代数中，符号x通常代表一未知数。
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。
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。
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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