什么是开放性词类？什么是封闭性词类？
次要词类属于封闭性词类，因为这些词类中的词的数量是固定的，不能添加新的成分。
Minor lexical categories are closed categories because the number of lexical items in these categories is fixed and no new members are allowed for.
现代汉语指示代词功能的特殊性、高度的封闭性等特性使其在词类体系中具有独特的地位。
The features of the particular function and high encapsulation of demonstrative pronouns in modern Chinese bestow these pronouns a unique position in the words family.
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