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by stages and in groups (or batches)～进行proceed by stages and by(or in)groups;undertake group after group and at different times
比喻分步骤进行。by stages and in groups, batch by batch and stage by stage, stage by stages and group by group
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。