1Salager - Meyer. F. Vague Expressions and Textual Communica- tive Function in Medical English Written Discourse [ J ]. English for Scientific Purposes, 1994, 13 (2): 149 -170.
2Dravc N. Vaguely Speaking: a Corpu~ Approach to Vague Lan- guage in Intercultural Conversations [ M ]. Hong Kong: City Uni- verslty of Hong Kong, 2002.