1Grice,H.P.Logic and Conversation In Syntax and Semahtics,3:Speech Acts,New York:Academic Press,1975.
2Lakoff,G.A Study in Meaning Criterta and the Logic of Fuzzy Concepts[J].Journal of Philosphical Logic,1972(2).
3Prince,E.,Frader,J.,and Bosk,C.1982.On Hedging in Physician-Physician Discourse[A].In R.J.Di Peitro(Ed.),Linguistics and the Professions[C].Hillsdale,NJ:Ablex.
