The content and recognizing the method of historical research object are important theories of history.

历史研究对象的内容和认识历史研究对象的方式是历史学中重要的理论。

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The content and recognizing the method of historical research object are important theories of history.

历史研究对象的内容和认识历史研究对象的方式是历史学中重要的理论。

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