5[3]Haiman,J. Natural Syntax [M]. Cambridge: Cambridge University Press,1985b.
6[4]Labov, W, The Boundaries of Words and Their Meaning[A]. In C.-J. Bailey and R. W. Shuy(eds. ) New Ways of Analysing Variation in English[C]. Washington :Georgetown University Press, 1973.
7[5]Lakoff,G. Hedges :A study in meaning criteria and the logic of fuzzy concepts [J]. Journal of Philosophical Logic, 1973: 458-508.
8[6]Rosch,E. Cognitive Representation of Semantic Categories [J]. Journal of Experimental Psychology: General ,1978:104.