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1.List 13561 most important English words by their using frequency from American National Corpus which includes 4.1 billion English words2.The words are divided into 5 sets, each word are more important than the one after. This could help user to learn English more efficiently by learning words from the most important ones and avoiding rare used ones.3. Real human pronunciation, American accent In this first version, only English-Chinese translation is available, new language translations will come in few months.