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retain one’s post during absence from duty~学习 take a study course without being formally relieved of one’s post /~培训 in-service (or on-job) training
英汉词典共收录311570条英汉翻译词条,基本覆盖所有常用英文单词的例句及中文翻译,是不可多得的英语学习材料。