术语解释：Language: Language is a system of arbitrary vocal symbols used for human communication. Linguistics: Linguistics is the scientific and systematic study of language. Design features（甑别性特征）: Design features refer to the defining properties of human language that distinguish it from any animal system of communication Arbitrariness(任意性): It means that there is no logical connection between meanings and sounds Productivity /creativity (创造性）: Language is produc
