题目内容
By diachronic study we mean to study the changes and development of language.
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Language change is universal, ongoing and arbitrary.
Language is a system of arbitrary, written signs which permit all the people in a given culture, or other people who have learned the system of that culture, to communicate or interact.
Applied linguistics is the application of linguistic principles and theories to language teaching and learning.
When language is used to get information from others, it serves an informative function.
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