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The research was to look back firstly, and made a corresponding definition of key concepts.
首先对国内外的研究作了一番回顾，并对重点概念作了相应界定。
youdao
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The research was to look back firstly, and made a corresponding definition of key concepts.
首先对国内外的研究作了一番回顾，并对重点概念作了相应界定。
youdao