Dialectal variation
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1 微课
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2 复习作业
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3 知识拓展
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NOTE:此视频仅限教学使用。 1-- dialectology: [U] the study of dialects, trying to map out all of the regional variations of a given language.
2-- dialect: any variety of a language associated with a group of people.
3-- demographics: data relating to the population and different groups within it

