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, an important concept in the law of obligation in the Continent law System, is one of core questions in contract law.
合同履行中的附随义务，是债法中的传统问题，在理论界偶有论述。
The incidental obligation in executing contracts, which is occasionally dealt with in the theory circle, is a traditional issue in the law of debt.
合同履行中的附随义务，是债法中的传统问题，在理论界偶有论述。
The incidental obligation in executing contracts, which is occasionally dealt with in the theory circle, is a traditional issue in the law of debt.
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