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nbsp;language  and  its  learning.  According  to  the investigation  made  by  other  researchers,  many  students  only  memorize  the  written form  of  words  and  don’t  know  the  meaning  and  how  to  pronounce  them.  So  when they  read  some  materials,  they  feel  that  they  are  familiar  with  the  words,  but  they don’t  know  the  meaning,  which  does  not  mean  that  they  really  remember  the vocabulary entries. In the Chinese academic setting, a large number of college students have lots of difficulty  in  memorizing  new  words  but  easily  forgetting  those  words  they  already learnt quickly. Their small vocabulary size limits them in understanding English texts, even sentences, as well as writing English words. Confusion in reading, listening and writing causes failure in examination, and it is deducible that vocabulary size also has effect  on  teaching  process,  and  inadequate  vocabulary  hinder  teachers’  complete teaching system, which can be a vicious circle between teacher and students.  
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Chapter Two   Literature Review 

2.1 General Explanation of Category Theory and Categorization 
The first thing, before going for others, could be to make it clear what category is. Categories consist of objects or events that have been grouped together because they are felt somehow related, and the ability to categorize enables man to interact with his environment  without  becoming  overwhelmed  by  its  complexity.  Therefore,  the classification  of  different  objects  or  events  can  be  conceived  as  a  mental  process, which serves as the starting point for the psychological and conceptual view of word meaning at the heart of cognitive linguistics. This mental process of classification is  now  commonly  called  categorization,  and  its  product  is  the  cognitive  categories  (F. Ungered & H. J. Schmid, 2005). For the linguist, categorization is an important issue because  it  underlies  the  use  of  words  and  the  use  of  language  in  general.  Since producing  and  understanding  language  undoubtedly  involve  cognitive  process, categorization is something necessary that takes place in our minds, and the categories resulting  from  it  can  be  understood  as  mental  concepts  stored  in  our  mind.  Five benefits of forming categories based on Stephen K. Reed (1992) are listed as follows: 1.  Categorizing  object  “reduces  the  complexity  of  the  environment.”  When  we classify discriminatively different objects as being equivalent, we respond to them in terms of their class membership rather than as unique items. 2. Categorizing is “the means by which objects of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。