5Aitchison, J. Language Change: Progress or Decay( 3rd ed) [ M]. Cambridge: Cambridge University Press, 2001.
6Davies, Mark. The Advantage of Using Relational Databases for Large Corpora: speed, advanced queries, and unlimited annotation [ J ]. International Journal of Corpus Linguistics, 2005.
7Firth , J. R. Papers in Linguistics 1934 - 1951 [C]. London : OUP, 1957.
8Gerbig A. Lexical and Grammatical Variation in a Corpus: A Computer-assisted Study of Discourse on the Environment [ M]. Frankerfurt am Main/Berlitz/New York/Paris/Wien: Peter Lang GmbH, 1997.
9Halliday, M. A. K. et al. Lexicology and Corpus Linguistics : An Introduction[ M ]. London: New York : Continuum, 2004.
10Hanks P. Definitions and Explanations. In: Sinclair J. Looking up: An Account of the COBUILD Project in Lexical Computing[ C ].Lordon -- Glasgow: Collins, 1987.
