Category describes this learning object in relation to a particular classification system. 范畴描述该学习对象和特定分类系统的关系。
Phenetic classification systems are based on many characters, and may also be weighted in favor of pqrticular characters. 表现型分类系统是建立在许多性状上的一种分类方法,尤其是利用一些主要的性状进行分类。