This method is not implemented.
未实作这个方法。
This method can be implemented by the calculation of the relational data base, and it is not necessary to fix Numbers of classes in advance.
这个方法可以利用关系数据库运算实现，而且不要求预先指定类数。
This criterion need not high frequency parameters, so the proposed method is easy to set and implemented.
该判据不需要高频参量，易于整定和实现。
This criterion need not high frequency parameters, so the proposed method is easy to set and implemented.
该判据不需要高频参量，易于整定和实现。
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