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Onomatopoeic words are totally arbitrary.
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English consonants can be classified into two categories: voiced and voiceless consonants.(对外经贸2006研)
By diachronic study we mean to study the changes and development of language.
The concept competence originally refers to the grammatical knowledge of the ideal language user and has nothing to do with the actual use of language in concrete situation.(南开大学2004研)
Syntax refers to the study of the rules governing the way words are combined to form sentences in a language.（大连外国语学院2008研)
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