英语词汇free of charge upon request怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

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英汉双解词典包含2273206条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。

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