第一部分是履行不能概述，这是本文进行研究的理论前提。
Part I is introduction of impossibility of performance, and it's the theoretical precondition of the research.
本文共分四个部分对履行不能进行研究。
This article is divided four parts to research the impossibility.
本文共分四个部分对履行不能进行研究。
This article is divided four parts to research the impossibility.
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