Part I is introduction of impossibility of performance, and it's the theoretical precondition of the research.
第一部分是履行不能概述，这是本文进行研究的理论前提。
Impossibility of original performance, a law term in contrast to impossibility of subsequent performance, is one of impossibility of performance when a contract has been signed.
自始履行不能是相对嗣后履行不能的法律术语，主要是指合同签订之时就已存在的履行不能。
Impossibility of performance, an important concept in the law of obligation in the Continent law System, is one of core questions in contract law.
履行不能是大陆法系债法上的重要概念，与迟延履行、不完全履行共同构成债务不履行的三大形态，是契约法上的核心问题之一。
Impossibility of performance is mainly a concept of the contract law in Civil Law, and is generally regulated in performance obstacles in the civil laws of many countries.
履行不能主要是大陆法中合同法的一个概念，各国民法一般在履行障碍法中对其进行规定。
Impossibility of performance is mainly a concept of the contract law in Civil Law, and is generally regulated in performance obstacles in the civil laws of many countries.
履行不能主要是大陆法中合同法的一个概念，各国民法一般在履行障碍法中对其进行规定。
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