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来源：雅诚德英语网
As an important principle during the performance of contract, the substantial change of circumstance system is provided in continental law system and common law system countries.
情势变更原则作为合同履行的重要原则，在大陆法系及英美法系国家均有规定。
As an important principle during the performance of contract, the substantial change of circumstance system is provided in continental law system and common law system countries.
情势变更原则作为合同履行的重要原则，在大陆法系及英美法系国家均有规定。