概念 各国重复类似的行为而具有法律拘束力的 惯例 物质因素(material element)：实践 心理因素(psychological element) ～法律确信 (opinio juris) 持续时间：“即时”习惯法（instant custormary law）：郑斌...
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跨国婚姻最重要的是感情而不是物质因素。
Transnational marriage is the most important factor in the feelings rather than substance.
物质因素还必须由无形的信念和献身精神来推动。
Material elements needed the impetus of intangibles of faith and dedication .
简言之，这些都是任何一个国家为了保证国民幸福而必须提供的物质因素。
In short, these are the material factors that any State must provide to its people in order to ensure their happiness.
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