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This chapter is a brief introduction of the thesis. It starts with an illustration ofthe background of the present study. And then the purpose of the study is put forwardand there is a structure of the thesis at the end of this section.此本章是一个简短的的的引进的本论文中。它开始与一个的本的研究中的插图的]国税发[背景。然后，研究的目的是把病房在本节结束时，有一个结构的论文。

1.1 Background of the study
主要有两部分的语言知识，词汇知识和语法知识，这是彼此密切相关。词汇知识语法知识的基础上，是一个重要的人的意思和信息媒介，通过它可以表示和交付。事实上，不仅是词汇知识的基础语法知识，但也对语言知识的基础。所有的学习者到开始第二LEAM？ “真语言”从收购，词汇知识。因此，词汇知识是任何语言具有十分重要的意义。麦卡锡（1990）指出了，“不管弓以及在学生学习的语法，无论多么成功，L2的声音都掌握了，没有的话来表达一个含义更广范围，L2的通信只是可以不发生任何有意义的方式，'。'因此，收购AW语言学习者，本地或者非本地的，词汇的重要性是不言而喻的。无线}金穗（1972）声称，“没有语法，几乎可以传达;没有词汇，没有什么可以传达”。施密特（2001）也指出，“词汇是语言的基本构建块。”因此，语言学习'词汇知识一直是他们的综合语言运用能力，如听，说，读，写，译的坚实基础。如果没有足够的词汇量，语言技能也难以表现良好。
There are mainly two parts of language knowledge: vocabulary knowledge andgrammar knowledge, which are closely related with each other. Vocabularyknowledge is the basis of grammar knowledge and is an important medium throughwhich people's meaning and information can be expressed and delivered. Actually，vocabulary knowledge is not only the basis of grammatical knowledge but also thebasis of language knowledge. All the L2 learners have to start to leam a second? -ilanguage from the acquisition of its, vocabulary knowledge. Therefore, vocabularyknowledge is of great significance for any language. McCarthy (1990) pointed outthat “no matter bow well the student learas grammar, no matter how successful thesounds of L2 are mastered, without words to express a wider range of meanings,communications in an L2 just cannot happen in any meaningful way，’. Therefore, theimportance of vocabulary acquisition to aW language learners, native or non-native, isself-evident. Wi}kins (1972) claimed that “without grammar, little can be conveyed;without vocabulary, nothing can be conveyed". Schmitt (2001) also pointed out that"vocabulary is an essential building block of language.” Therefore, language learners'vocabulary knowledge has always been a solid foundation of their comprehensivelanguage abilities such as listening, speaking, reading, writing and translating.Without sufficient vocabulary, language skills can hardly be performed well.
In spite of its importance in SLA，the L2 vocabulary acquisition has beenneglected until the 1970s. Since then the researchers abroad have begun to payattention to vocabulary acquisition and they have made a lot of progress and publishedmany papers and books. The L2 vocabulary research received close attention in Chinain the early 1980s, a little later than the western countries. With the development ofthe research, a lot of linguists, researchers, and teachers have begun to realize thatwords are the basic structures to express people's ideas in verbal communication andvocabulary knowledge is an indispensable part of language proficiency. Therefore，more and more attention has been paid on L2 vocabulary knowledge and researchesabout L2 vocabulary knowledge have begun to increase.
The research at home and abroad has been developing towards all respects of L2vocabulary acquisition study such as vocabulary size assessment，the development ofvocabulary knowledge, mental lexicon, tests of vocabulary knowledge, vocabularyacquisition strategy and so on. Although vast quantities of researches about L2vocabulary acquisition have been conducted, most of them are concentrated on theacquisition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。