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ypes and brands have diverse functions, generally speaking, most of them share the following common features.

　　2.2.1 Information retrieval

　　This is the basic and the most important function, without which, PED, (actually any dictionary) would become useless. Thanks to the development of technology, users can learn some knowledge about vocabulary simply by inputting some words at the retrieval entry. PED provides a lot of information about words, including pronunciation, word class, meaning, usage, register, grammar, examples and etymology, etc.

　　2.2.2 Information display

　　PED can present the enquired information on the screen instantly. Users can get what they want to know about a word, a phrase or an expression in a second. This function serves as a link between the user and the PED.

　　2.2.3 Pronunciation function

　　It is a function that the paper dictionary does not possess. Users can learn how to pronounce a word correctly with the aid of PED. This function is especially useful for beginners. Users can also record their own pronunciation and then compare it with the correct one installed in PED, thus helping improve their pronunciation.

　　2.2.4 Auxiliary functions

　　In addition to the fundamental functions, PED also provides some auxiliary devices. For example, many users can store some information in their PED. They can keep some newly learned words in the notebook in PED and review them regularly. Some PEDs provide vocabulary exercise, which is useful for English learners. Furthermore, most PEDs have the downloading function, through which users can get access to the abundant information on the Internet. And they can also play games and get some entertainment with PED. In short, PED enjoy many superior functions that cannot be found in the traditional paper dictionary.

　　2.3 The advantages and disadvantages of PED

　　As a product of modern educational technology, PED provides great convenience to English learners. It is becoming more and more popular among users for its incomparable advantages. However, because of the limitations of technology, there are also some undeniable disadvantages.

　　2.3.1 The advantages of PED

　　The most remarkable advantage of PED is its quick retrieval and high efficiency. Users can obtain the needed information about words in a blink of eyes. Compared with the traditional paper dictionary, PED can save a lot of time and effort. Owing to its small size and light weight, PED can be carried from one place to another and can be used at any time and in any place. Additionally, PED is usually based on the traditional paper dictionary which has a solid foundation of lexicography. Due to the large capacity, new vocabulary can be introduced into PED quickly. Theoretically speaking, it has an unlimited and infinite capacity [2]140. Moreover, PED provides lots of auxiliary functions. Many PEDs have download function and can be upgraded regularly. Users could amuse themselves by listening to music or playing games when they are tired. To sum up, there are superior advantages of PED with which the paper dictionary could not compare. It offers information, convenience, efficiency as well as entertainment. 

　　2.3.2 The disadvantages of PED

　　Though PED provides great convenience to English learners, its 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。