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earners’ learning autonomy inlanguage acquisition.Some former studies (Guan Li, 2005; Cao Xiaojuan, 2007; Zhao Ming, 2009) ondictionary use mainly aims to examine situations of paper dictionary use in collegeEFL learning process，giving minor attention to those of e-dictionary use among EFLlearners of today and different impacts of these two types of dictionaries on them.
This study is going to replicate some previous findings and also added some newpoints to dictionary use study, which has some implications for college Englishteaching.But the findings of this study, it is supposed, may help people to understand thedefinition and different types of e-dictionary; advantages and disadvantages ofe-dictionary; the current situation and trends of dictionary use by present post-90sEFL learners; dictionary use frequency, purposes, timing and other strategiesemployed by post-90s EFL learners; the impacts of e-dictionary use on EFLvocabulary acquisition and dictionary use of post-90s EFL learners.

Chapter 2 Literature Review

2.1 Introduction to E-Dictionary Study
1940s’ American research on machine translation marks the beginning ofe-dictionaries. But it was not given too much concern by people until 1980s whenpersonal computer (PC) was first introduced and becoming more and more popular,more importantly, compact disc read-only memory (CD-ROM) began to be applied incomputers and major progress had been made in the study of machine translation.Thence portable e-dictionaries, computer dictionaries, CD-ROM dictionaries, evenonline dictionaries came into being and were accepted and welcomed by peoplegradually. Although these new types of dictionaries are various in forms, they are innature applications of modern electronic information technology.In English language, however, an e-dictionary has some other names likecomputer-aided dictionary, computer-assisted dictionary, computer-based dictionary,computerized dictionary, etc. Though confusing, these names contains two basic facts:e-dictionaries without question are built on the technology of electronics andcomputer; their information is displayed on digital screen instead of paper. The latterone is a main difference between e-dictionaries and paper dictionaries.Hartmann and James (2000) defined an e-dictionary as "a Reference book that candisplay the information on digital screen by using computer and the relevanttechnology”. Nesi (2009) considered that an e-dictionary is a dictionary whose dataexists in digital form and can be accessed through a number of different media.
The blossom of computer and internet technology has revolutionized lexicology.A variety of e-dictionaries emerge as required. Zhang Yihua (2007) considered thatthe information carrier of an e-dictionary can be based on electronic, optical ormagnetic medium like compact disc, magnetic disk, magneto optical disk, flashmemory disk or micro chip. With the help of micro processor and other relatedcomponents, vocabulary knowledge can be searched and displayed with very high speed and accuracy. Broadly speaking, e-dictionaries include all kinds ofdictionaries stored in electronic, optical or magnetic medium, such as various generaland specialized dictionaries, encyclopedia, multi-language terminology database,liine dictionary in translation system, corpus, various internet-based dictionariesand database, spelling checker in word processors or editor (like Microsoft Word) and本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。