但若假设的概率密度函数与真实概率密度函数差异较大，源信号将不能被正确分离。
If the assumed PDF is different from the true PDF considerably, the sources will not be separated correctly.
在密度统计过程中，把岩体结构面样本在空间上的概率密度分布假设成正态分布。
During the statistical process of density, the probability density distribution of the rock mass structural plane in sample space is assumed as normal distribution.
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