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Introduction： Language is a very important communicative tool that people all around the world can use to convey the meanings of their intention. In order to learn a language, vocabulary, the building material, is a very essential element. It is one of the three basic components of language which are called pronunciation, vocabulary and grammar, and is of utmost importance to people＇ s communication and language learning. Language emerges first as words, and the coining of new words never stops. Pronunciation and grammar are presented by vocabulary. The British applied linguist David Wilkins （1972） once summed up the utmost importance of vocabulary in his book Linguistics and Language Teaching： Without grammar very little can be conveyed ; but without vocabulary nothing can be conveyed. This sentence in his book clearly stands out the significance of vocabulary to language learning.