请教英语语言学里的open class和closed class区别

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Open class words----content words of a language to which we can regularly add new words,such as nouns,adjectives,verbs and adverbs
Closed class words----grammatical or functional words,such as conjunction,articles,preposition and pronouns
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供参考答案1:
这是讲英语语言的来源，也就是“词”的来源。英语的词从语法功能分可分两类：封闭词类(closed class)和开放词类(Open Class）。