题目内容
Duality is one of the characteristics of human language. It refers to the fact that language has two levels of structures: the system of sounds and the system of meanings.
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Language is a means of verbal communication. Therefore, the communication way used by the deaf-mute is not language.
Arbitrariness of language makes it potentially creative, and conventionality of language makes a language be passed from generation to generation. As a foreign language learner, the latter is more important for us.
By diachronic study we mean to study the changes and development of language.
Language change is universal, ongoing and arbitrary.
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