protolanguage用英语语言学知识回答~~名词解释~~ 谢谢英语高手~~

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protolanguage用英语语言学知识回答~~名词解释~~     谢谢英语高手~~

protolanguage用英语语言学知识回答~~名词解释~~ 谢谢英语高手~~
protolanguage用英语语言学知识回答~~名词解释~~
谢谢英语高手~~

protolanguage用英语语言学知识回答~~名词解释~~ 谢谢英语高手~~
Protolanguage refers to the original form of a language family which has ceased to exist.