According to Charles F.Hockett(1916-2000),an American linguistic anthropologist,there are fifteen design features of language.They are interchangeability,feedback,specialization,semanticity,arbitrariness,discreteness,displacement,productivity,grammatical patterning,idioms,cultural transmission,duality,prevarication,relexiveness,and learnability respectively.In the essay,the notion that a foreign language can be learned and mastered in a short period of time is debated based on human language’s arbitrariness,productivity,displacement,and duality.