4.one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems.
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Old World tropical fern; in some classification systems placed directly in family Polypodiaceae.
旧大陆的热带蕨；在一些分类系统中直接归入水龙骨科。
Since multiple classifier systems can to some extent improve the performance of classification, the technique has been widely used in various fields of pattern recognition.
多分类器系统能够在一定程度上弥补单个分类器的缺陷，因此它在模式识别中得到了广泛的应用。
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