making unit (DMU). Based upon a set of modified DEA models, this paper develops an approach to identify的翻译：什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

翻译结果1 翻译结果2 翻译结果3 翻译结果4 翻译结果5

决策单元（DMU）。基于改进DEA模型，本文开发了一个方法来确定

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