The preface introduces the necessity of researching the ghost drama and the paper's construction briefly.

前言部分简要介绍鬼戏研究的必要性和本文的结构布局。

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The fourth part takes the connection between the factor of plot, ghost drama and even drama's maturity into consideration.

探索情节性因素与鬼戏乃至戏剧的成熟之间的联系。

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