精选优质文档-倾情为你奉上Define the following terms:1. design feature:are features that define our human languages,such as arbitrariness,duality,creativity,displacement,cultural transmission,etc.2. function: the use of language tocommunicate,to think ,etc.Language functions inclucle imformative function,interpersonal function,performative function,interpersonal function,performative function,emotive function,phatic communion,recreational function and metalingual function.3. eti