未知数: 1.[数学] unknown number2.(不确定) unknown; uncertain 短语和例子学院今年的春运会是否开还是个未知数。 it's still uncertain whether the college spring sports will be held this year
A new method for blind separation of sparse sources with unknown source number 未知数量稀疏源盲分离的一种新方法
2.
Sunday ' s shooting was the latest in a series of incidents in which blackwater and other foreign contractors have been accused of shooting to death an unknown number of iraqi citizens 周日的枪击事件是最近一系列事故中的一起，在这些事故中，黑水公司和其他外国公司已经因枪杀未知数量的伊拉克人民而被指控。
