科研之友
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<正>Many advanced English learners have a large"passive2 vocabulary",but they worry about the size of their"active vocabulary".They can understand many difficult English words when reading or listening,but they don’t use most of them when speaking or writing in English.They feel this is a problem.They would like to use all the difficult words that they know.许多高水平英语学习者都有大量的"不活跃词汇",但他们担心自己的"活跃词汇"量。他
