在前言中阐述了本次课题的研究动机、对象、方法及意义。
In the preface, the author elaborates the motive, object, method and meaning of this work.
前言在提出问题的基础上，阐明本课题的研究意义。
In Preface Part the significance of the question for study was clarified.
前言在提出问题的基础上，阐明本课题的研究意义。
In Preface Part the significance of the question for study was clarified.
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