说明本文的研究理论依据、主要内容设计、研究目的、创新性以及国内外的研究现状。

Explains the research basis, main content design, the research object and significance, domestic and international existing research state about this field.

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说明本文的研究理论依据、主要内容设计、研究目的、创新性以及国内外的研究现状。

Explains the research basis, main content design, the research object and significance, domestic and international existing research state about this field.

youdao