Chapter Three Lexicon Morphology 3.3 According to their membership: closed-class and open- class words(封闭类词和开放类词) An close class is one whose membership is in principle fixed or limited.(封闭类:连介代 冠) An open class is one whose membership is in principle indefinite or unlimited. (开放类:名 动形副数叹Chapter Three Lexicon & Morphology 3.3 According to their membership:c1osed- class and open-class words (封闭类词和开放类词) An close class is one whose membership is in principle fixed or limited. （封闭类：连介代 冠） An open class is one whose membership is in principle indefinite or unlimited. (开放类：名 动形副数叹)