I think the issue of learning English is a doctoral student's knowledge of vocabulary. Because most of the words in the English language has many meanings, and most students know the meaning of the words, but I do not know the meaning of every cause can affect communication in the English language to foreigners, because when a student does not know the meaning of words will cause communication problems at the time because they do not understand communication, however, you have spoken to us that people want to use it, meaning human misunderstandings.
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