大陆法系不当得利制度起源于罗马法，但是在古罗马并无现代意义所称的不当得利的一般原则。
Unjust enrichment in civil-law system originated from Roman law, but what is designated in modem sense did not exist in ancient Rome.
行政犯罪的概念源于古罗马法中自然犯、法定犯概念，关于行政犯罪的性质在理论上有不同的观点。
The concept of administrative crimes is related with natural crimes and legal crimes from Roman law. There are different theories in the nature of administrative crimes.
一事不再理原则起源于古罗马法，在近现代大陆法系形成了以既判力为基础的一事不再理原则，而英美法系则形成了以禁止双重危险为基础的一事不再理原则。
But in the contemporary era, Continental laws have formed the principle on the basis of the adjudged force, while Anglo-American laws take protection against double jeopardy as the basis of it.
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