通常，一组有序数据的类别有自然的顺序，但尺度上相邻点之间的差距不必总是相同的。
Usually, categories for an ordinal set of data have a natural order, but the distinction between adjoining points on the scale is not necessarily always the same.
类别可分性判据对缺陷信号的特征提取也起了定量衡量尺度的作用。
And the sort separability criterion can also play the role of being a quantification measure on the characteristic extracting of flaw signals.
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