With the text as its basic unit, the essential function of language is to communicate.
语言的基本功能在于社会交际，语篇是它的基本单位。
Words are the basic unit of language.
词汇是语言的基本单位。
The word is the basic unit in language.
单词是基本的语言单位。
Morpheme, the basic unit of language, is always accompanied by semantic change.
词作为语言的一个基本单位，其语义总是不断变化的。
Discourse is the basic unit of language.
语篇是语言的基本单位。
Discourse is the basic unit of language.
语篇是语言的基本单位。
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