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nbsp;teaching  principle,  including strengthening the guidance of students’ learning strategies, helping students form the independent learning ability. In addition, it shows that the senior high school stage is the  key stage for students  to accumulate English vocabulary. However, there are still problems  in  English  vocabulary  teaching  in  senior  high  school.  Teachers  make  the vocabulary  teaching isolated and ignore the importance of  the  knowledge  net  as well as the connection between the new knowledge and the old knowledge. And the senior high school students  feel that learning vocabulary is boring. Therefore, the educators should try  to explore a flexible and effective teaching approach to  help  make English vocabulary teaching  and learning  effective.  
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Chapter 2 Literature Review 

In  this  chapter,  it  mainly  includes  three  parts.  The  first  part  is  about  vocabulary teaching, which involves the definition of vocabulary, implication of knowing a word, and  the  organization  of  word  knowledge  in  mind  as  well  as  principles  of  vocabulary teaching.  The  second  part  refers  to  Schema  Theory,  and  it  involves  the  definition  of schema,  the  classifications  of  schemata,  the  characteristics  of  schemata  and  the functions of schemata. And the last part is about the previous study of Schema Theory and vocabulary teaching  abroad and in China. 

2.1 Vocabulary teaching 
This part  mainly refers to  the  theory about vocabulary teaching, which involves the definition of vocabulary, implication of knowing a word, the organization of word knowledge  in mind  and principles of vocabulary teaching. In  the  19th  century,  a  word  is  defined  as  the  smallest  unit  of  language,  which means  the vocabulary  makes  up  the phrases, the phrases compose  the sentences, and the  sentences  form  the  text  or  course.  Sapir  (1921)  points  out  that  the  word  is  the smallest,  the  most  complete  and  the  most  independent  semantic  unit.  Bloomfield (1933)  holds  that  a  word  is  a  minimum  free  form.  According  to  Oxford  Advanced Learner's  English-Chinese  Dictionary  (7th  edition),  vocabulary  refers  to  the  words making  up  language  or  the  words  known  and  used  by  people.  According  to  the modern lexicology, it tends to use the decomposition method to define a word, that is, a word is the combination of the specific features of the  morphology, the syntax and the semantics. In a broad sense, vocabulary is a sum of all the w ords and phrases. In a narrow sense, vocabulary is a sin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。