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关系代词是引入关系从句的单词，关系从句提供有关句子中前面提到的名词或名词短语的附加信息。
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used to refer to people or animals with names
used to refers to animals and things
used to introduce relative clauses that refer to people, animals, or things
used to refer to people in formal English, particularly when they are the object of a verb or preposition
used to show that the thing mentioned belongs to a particular person or thing
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