What is language
Language is a system of arbitrary vocal symbols used for human communication 2
Design features of language ①Arbitrariness( 任意性 )refers to the forms of linguistic signs bear no natural relationship to their meaning
(sounds and meanings) ②Duality( 二层性):The property of having two levels of structures, such that units of the primary level are composed of elements of the secondary level and each of the two levels has its own principles of organization
③ Productivity/creativity(创 造 性 ) :Language is productive in that it makes possible the construction and interpretation of new signals by its users
④Displacement( 移位性 ):Human Languages enable their users to symbolize objects, events and concepts which are not present (in time and space) at moment of communication
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