在现代民法理论上，人格与人格权两者具有不同的含义，在概念体系中，它们分处不同层次；
In modern civil Law theory, persona and personal rights have different meaning and they get different status in the system of concept.
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.
物在民法学上是一个被广泛使用的概念。
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