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ss. A good user should know at least three points as follows:

　　4.1 How to choose a proper PED

　　4.1.1 To know about the needs

　　On purchase of PED, a user should first have a clear idea about his needs and then choose a type of PED according to his English proficiency. For a non-English major, it is suitable to choose a PED with a relatively small vocabulary and clear and concise definition. As far as an English major is concerned, it is necessary to choose a PED with a large vocabulary and detailed and exact definition [4].
　4.1.2 To take into consideration the paper dictionaries installed in PED 
　　It is necessary to pay much attention to the authority of paper dictionaries installed in PED upon dictionary purchase. At present, the installed paper dictionaries such as Oxford English Dictionary, Collins English Dictionary and Longman Dictionary of Contemporary English are well received. Besides, the impression and content of the installed dictionaries should also be taken heed of. In addition, the publishing house is also a factor that needs considering.

　　4.1.3 To examine the quality of PED

　　It is advisable to take a quality paper dictionary when buying a PED. In order to examine the definition, pronunciation, usage, grammar and examples in the PED, buyers need to compare them with those of paper dictionary. A good PED should have detailed explanation about various categories of information such as meaning, grammar, usage, collocation and examples, etc. Furthermore, buyers should also take heed whether the PED has recorded the neologism to keep abreast with the development of language.

　　4.1.4 To choose a famous brand

　　PED is a product of a new industry. The market has been flooded with various PEDs some of which are good while others are inferior. The quality of some products by small workshops might not be reliable. With the development of market economy, these small enterprises are doomed to bankruptcy. Therefore, it is essential to choose those famous brands so as to guarantee the quality of PED.

　　4.2 How to foster a reasonable attitude towards PED

　　Recent years have seen an increasingly number of PED owners and users. PED plays an important role in English learning. Though learners know about some famous PED, they have little and equivocal knowledge about their functions, features and target users. Most users only judge PED by its convenience and functions, without considering other criteria such as informativeness, scientificness and its coverage [5]. They have not made full use of the information that PED provides. Consequently, teachers ought to instruct students to foster a reasonable attitude towards PED and use it appropriately and correctly.

　　With its advantages of small size, large capacity and easy use, PED becomes very popular among students, but at the same time, its negative influence has also come to be felt. The compilers might not work seriously and scientifically. Moreover, because of the limitations of the screen size, the information showed at one time is limited. Consequently, users should have a thorough understanding about the nature of PED. They should acquaint themselves with the merits and demerits of PED and thus develop a right perception about it. They should know not to wordship PED blindly and avoid over-dependence on or overuse 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。